I'm trying to mix and match a GTK theme with a different Window Decoration, but I cant see where this can be done. The Unity-Tweak-Tool changes the two in tandem, but this is not necessarily what I want.
1 Answers
You can try to change the Window theme and the GTK theme separately using the gsettings command, Ubuntu Tweak or gnome-tweak-tool.
Gsettings
There are two schemas, for the gtk theme is org.gnome.desktop.interface & for the window theme is org.gnome.desktop.wm.preferences.
In this example I will set the gtk-theme to Ambiance and the Window-theme to Radiance.
1) Open a Terminal window Ctrl+Alt+T and type:
gsettings set org.gnome.desktop.interface gtk-theme Ambiancegsettings set org.gnome.desktop.wm.preferences theme Radiance
The result in Nautilus:

Ubuntu-Tweak
To install ubuntu-tweak you can add this ppa.
1) Open a Terminal window Ctrl+Alt+T and type:
sudo add-apt-repository ppa:tualatrix/ppasudo apt-get updatesudo apt-get install ubuntu-tweak
2) Open the Ubuntu-Tweak and go to Tweaks -> Theme.


Gnome-Tweak-Tool
To install the gnome-tweak-tool
1) Open a Terminal window Ctrl+Alt+T and type:
sudo apt-get install gnome-tweak-tool
2) Open the gnome-tweak-tool application and go to Theme.

NOTE: In this application the window-theme is named as Current Theme.
Hope this helps.
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3This solution (`gsettings`) does not seem to work as of Ubuntu 14.04 – danjjl Jun 25 '15 at 20:18
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3changing window theme in ubuntu tweak doesn't work. – R T Sep 04 '15 at 03:04
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1ubuntu-tweak not found in 16.04 (sorry, cannot comment the previous answer) – Cor Nouws Aug 05 '16 at 20:38