diff --git a/src/bitmessageqt/__init__.py b/src/bitmessageqt/__init__.py
index 40113b5a..1b1a7885 100644
--- a/src/bitmessageqt/__init__.py
+++ b/src/bitmessageqt/__init__.py
@@ -62,6 +62,9 @@ except ImportError:
     get_plugins = False
 
 
+is_windows = sys.platform.startswith('win')
+
+
 # TODO: rewrite
 def powQueueSize():
     """Returns the size of queues.workerQueue including current unfinished work"""
@@ -80,7 +83,7 @@ def openKeysFile():
     keysfile = os.path.join(state.appdata, 'keys.dat')
     if 'linux' in sys.platform:
         subprocess.call(["xdg-open", keysfile])
-    elif sys.platform.startswith('win'):
+    elif is_windows:
         os.startfile(keysfile)  # pylint: disable=no-member
 
 
@@ -868,7 +871,7 @@ class MyForm(settingsmixin.SMainWindow):
         """
         startonlogon = config.safeGetBoolean(
             'bitmessagesettings', 'startonlogon')
-        if sys.platform.startswith('win'):  # Auto-startup for Windows
+        if is_windows:  # Auto-startup for Windows
             RUN_PATH = "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run"
             settings = QtCore.QSettings(
                 RUN_PATH, QtCore.QSettings.NativeFormat)
@@ -4233,6 +4236,14 @@ class BitmessageQtApplication(QtGui.QApplication):
     # Unique identifier for this application
     uuid = '6ec0149b-96e1-4be1-93ab-1465fb3ebf7c'
 
+    @staticmethod
+    def get_windowstyle():
+        """Get window style set in config or default"""
+        return config.safeGet(
+            'bitmessagesettings', 'windowstyle',
+            'Windows' if is_windows else 'GTK+'
+        )
+
     def __init__(self, *argv):
         super(BitmessageQtApplication, self).__init__(*argv)
         id = BitmessageQtApplication.uuid
@@ -4241,6 +4252,14 @@ class BitmessageQtApplication(QtGui.QApplication):
         QtCore.QCoreApplication.setOrganizationDomain("bitmessage.org")
         QtCore.QCoreApplication.setApplicationName("pybitmessageqt")
 
+        self.setStyle(self.get_windowstyle())
+
+        font = config.safeGet('bitmessagesettings', 'font')
+        if font:
+            # family, size, weight = font.split(',')
+            family, size = font.split(',')
+            self.setFont(QtGui.QFont(family, int(size)))
+
         self.server = None
         self.is_running = False
 
diff --git a/src/bitmessageqt/bitmessageui.py b/src/bitmessageqt/bitmessageui.py
index 961fc093..bee8fd57 100644
--- a/src/bitmessageqt/bitmessageui.py
+++ b/src/bitmessageqt/bitmessageui.py
@@ -61,7 +61,8 @@ class Ui_MainWindow(object):
         self.tabWidget.setMinimumSize(QtCore.QSize(0, 0))
         self.tabWidget.setBaseSize(QtCore.QSize(0, 0))
         font = QtGui.QFont()
-        font.setPointSize(9)
+        base_size = QtGui.QApplication.instance().font().pointSize()
+        font.setPointSize(int(base_size * 0.75))
         self.tabWidget.setFont(font)
         self.tabWidget.setTabPosition(QtGui.QTabWidget.North)
         self.tabWidget.setTabShape(QtGui.QTabWidget.Rounded)
diff --git a/src/bitmessageqt/settings.py b/src/bitmessageqt/settings.py
index 3d05db25..eeb507c7 100644
--- a/src/bitmessageqt/settings.py
+++ b/src/bitmessageqt/settings.py
@@ -41,14 +41,17 @@ def getSOCKSProxyType(config):
 
 class SettingsDialog(QtGui.QDialog):
     """The "Settings" dialog"""
+    # pylint: disable=too-many-instance-attributes
     def __init__(self, parent=None, firstrun=False):
         super(SettingsDialog, self).__init__(parent)
         widgets.load('settings.ui', self)
 
+        self.app = QtGui.QApplication.instance()
         self.parent = parent
         self.firstrun = firstrun
         self.config = config_obj
         self.net_restart_needed = False
+        self.font_setting = None
         self.timer = QtCore.QTimer()
 
         if self.config.safeGetBoolean('bitmessagesettings', 'dontconnect'):
@@ -85,6 +88,15 @@ class SettingsDialog(QtGui.QDialog):
     def adjust_from_config(self, config):
         """Adjust all widgets state according to config settings"""
         # pylint: disable=too-many-branches,too-many-statements
+
+        current_style = self.app.get_windowstyle()
+        for i, sk in enumerate(QtGui.QStyleFactory.keys()):
+            self.comboBoxStyle.addItem(sk)
+            if sk == current_style:
+                self.comboBoxStyle.setCurrentIndex(i)
+
+        self.save_font_setting(self.app.font())
+
         if not self.parent.tray.isSystemTrayAvailable():
             self.groupBoxTray.setEnabled(False)
             self.groupBoxTray.setTitle(_translate(
@@ -137,7 +149,7 @@ class SettingsDialog(QtGui.QDialog):
                 "MainWindow",
                 "Tray notifications not yet supported on your OS."))
 
-        if 'win' not in sys.platform and not self.parent.desktop:
+        if not sys.platform.startswith('win') and not self.parent.desktop:
             self.checkBoxStartOnLogon.setDisabled(True)
             self.checkBoxStartOnLogon.setText(_translate(
                 "MainWindow", "Start-on-login not yet supported on your OS."))
@@ -322,6 +334,18 @@ class SettingsDialog(QtGui.QDialog):
         if status == 'success':
             self.parent.namecoin = nc
 
+    def save_font_setting(self, font):
+        """Save user font setting and set the buttonFont text"""
+        font_setting = (font.family(), font.pointSize())
+        self.buttonFont.setText('{} {}'.format(*font_setting))
+        self.font_setting = '{},{}'.format(*font_setting)
+
+    def choose_font(self):
+        """Show the font selection dialog"""
+        font, valid = QtGui.QFontDialog.getFont()
+        if valid:
+            self.save_font_setting(font)
+
     def accept(self):
         """A callback for accepted event of buttonBox (OK button pressed)"""
         # pylint: disable=too-many-branches,too-many-statements
@@ -348,6 +372,20 @@ class SettingsDialog(QtGui.QDialog):
         self.config.set('bitmessagesettings', 'replybelow', str(
             self.checkBoxReplyBelow.isChecked()))
 
+        window_style = str(self.comboBoxStyle.currentText())
+        if self.app.get_windowstyle() != window_style or self.config.safeGet(
+            'bitmessagesettings', 'font'
+        ) != self.font_setting:
+            self.config.set('bitmessagesettings', 'windowstyle', window_style)
+            self.config.set('bitmessagesettings', 'font', self.font_setting)
+            queues.UISignalQueue.put((
+                'updateStatusBar', (
+                    _translate(
+                        "MainWindow",
+                        "You need to restart the application to apply"
+                        " the window style or default font."), 1)
+            ))
+
         lang = str(self.languageComboBox.itemData(
             self.languageComboBox.currentIndex()).toString())
         self.config.set('bitmessagesettings', 'userlocale', lang)
diff --git a/src/bitmessageqt/settings.ui b/src/bitmessageqt/settings.ui
index 1e9a6f09..e7ce1d71 100644
--- a/src/bitmessageqt/settings.ui
+++ b/src/bitmessageqt/settings.ui
@@ -147,6 +147,32 @@
          </property>
         </widget>
        </item>
+       <item row="9" column="0">
+        <widget class="QGroupBox" name="groupBoxStyle">
+         <property name="title">
+          <string>Custom Style</string>
+         </property>
+         <layout class="QHBoxLayout">
+          <item>
+           <widget class="QComboBox" name="comboBoxStyle">
+            <property name="minimumSize">
+             <size>
+              <width>100</width>
+              <height>0</height>
+             </size>
+            </property>
+           </widget>
+          </item>
+	  <item>
+           <widget class="QPushButton" name="buttonFont">
+            <property name="text">
+             <string>Font</string>
+            </property>
+           </widget>
+          </item>
+	 </layout>
+        </widget>
+       </item>
        <item row="9" column="1">
         <widget class="QGroupBox" name="groupBox">
          <property name="title">
@@ -1202,5 +1228,11 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>buttonFont</sender>
+   <signal>clicked()</signal>
+   <receiver>settingsDialog</receiver>
+   <slot>choose_font</slot>
+  </connection>
  </connections>
 </ui>
diff --git a/src/bitmessageqt/tests/__init__.py b/src/bitmessageqt/tests/__init__.py
index a542abdc..a81ddb04 100644
--- a/src/bitmessageqt/tests/__init__.py
+++ b/src/bitmessageqt/tests/__init__.py
@@ -1,9 +1,9 @@
 """bitmessageqt tests"""
 
-from addressbook import TestAddressbook
-from main import TestMain, TestUISignaler
-from settings import TestSettings
-from support import TestSupport
+from .addressbook import TestAddressbook
+from .main import TestMain, TestUISignaler
+from .settings import TestSettings
+from .support import TestSupport
 
 __all__ = [
     "TestAddressbook", "TestMain", "TestSettings", "TestSupport",
diff --git a/src/bitmessageqt/tests/main.py b/src/bitmessageqt/tests/main.py
index b3aa67fa..d3fda8aa 100644
--- a/src/bitmessageqt/tests/main.py
+++ b/src/bitmessageqt/tests/main.py
@@ -1,19 +1,23 @@
 """Common definitions for bitmessageqt tests"""
 
-import Queue
 import sys
 import unittest
 
 from PyQt4 import QtCore, QtGui
+from six.moves import queue
 
 import bitmessageqt
-import queues
-from tr import _translate
+from bitmessageqt import _translate, config, queues
 
 
 class TestBase(unittest.TestCase):
     """Base class for bitmessageqt test case"""
 
+    @classmethod
+    def setUpClass(cls):
+        """Provide the UI test cases with common settings"""
+        cls.config = config
+
     def setUp(self):
         self.app = (
             QtGui.QApplication.instance()
@@ -24,14 +28,21 @@ class TestBase(unittest.TestCase):
             self.window.appIndicatorInit(self.app)
 
     def tearDown(self):
+        """Search for exceptions in closures called by timer and fail if any"""
         # self.app.deleteLater()
+        concerning = []
         while True:
             try:
                 thread, exc = queues.excQueue.get(block=False)
-            except Queue.Empty:
-                return
+            except queue.Empty:
+                break
             if thread == 'tests':
-                self.fail('Exception in the main thread: %s' % exc)
+                concerning.append(exc)
+        if concerning:
+            self.fail(
+                'Exceptions found in the main thread:\n%s' % '\n'.join((
+                    str(e) for e in concerning
+                )))
 
 
 class TestMain(unittest.TestCase):
diff --git a/src/bitmessageqt/tests/settings.py b/src/bitmessageqt/tests/settings.py
index 0dcf8cf3..bad28ed7 100644
--- a/src/bitmessageqt/tests/settings.py
+++ b/src/bitmessageqt/tests/settings.py
@@ -1,10 +1,14 @@
+"""Tests for PyBitmessage settings"""
 import threading
 import time
 
-from main import TestBase
+from PyQt4 import QtCore, QtGui, QtTest
+
 from bmconfigparser import config
 from bitmessageqt import settings
 
+from .main import TestBase
+
 
 class TestSettings(TestBase):
     """A test case for the "Settings" dialog"""
@@ -14,8 +18,7 @@ class TestSettings(TestBase):
 
     def test_udp(self):
         """Test the effect of checkBoxUDP"""
-        udp_setting = config.safeGetBoolean(
-            'bitmessagesettings', 'udp')
+        udp_setting = config.safeGetBoolean('bitmessagesettings', 'udp')
         self.assertEqual(udp_setting, self.dialog.checkBoxUDP.isChecked())
         self.dialog.checkBoxUDP.setChecked(not udp_setting)
         self.dialog.accept()
@@ -32,3 +35,44 @@ class TestSettings(TestBase):
         else:
             if not udp_setting:
                 self.fail('No Announcer thread found while udp set to True')
+
+    def test_styling(self):
+        """Test custom windows style and font"""
+        style_setting = config.safeGet('bitmessagesettings', 'windowstyle')
+        font_setting = config.safeGet('bitmessagesettings', 'font')
+        self.assertIs(style_setting, None)
+        self.assertIs(font_setting, None)
+        style_control = self.dialog.comboBoxStyle
+        self.assertEqual(
+            style_control.currentText(), self.app.get_windowstyle())
+
+        def call_font_dialog():
+            """A function to get the open font dialog and accept it"""
+            font_dialog = QtGui.QApplication.activeModalWidget()
+            self.assertTrue(isinstance(font_dialog, QtGui.QFontDialog))
+            selected_font = font_dialog.currentFont()
+            self.assertEqual(
+                config.safeGet('bitmessagesettings', 'font'), '{},{}'.format(
+                    selected_font.family(), selected_font.pointSize()))
+
+            font_dialog.accept()
+            self.dialog.accept()
+            self.assertEqual(
+                config.safeGet('bitmessagesettings', 'windowstyle'),
+                style_control.currentText())
+
+        def click_font_button():
+            """Use QtTest to click the button"""
+            QtTest.QTest.mouseClick(
+                self.dialog.buttonFont, QtCore.Qt.LeftButton)
+
+        style_count = style_control.count()
+        self.assertGreater(style_count, 1)
+        for i in range(style_count):
+            if i != style_control.currentIndex():
+                style_control.setCurrentIndex(i)
+                break
+
+        QtCore.QTimer.singleShot(30, click_font_button)
+        QtCore.QTimer.singleShot(60, call_font_dialog)
+        time.sleep(2)