I don't know how I did it, but now I'm stuck with this same window theme!
Whichever theme I change to, the window theme will stick and only the background colour of the window title will change.
Here I changed from Ambience Blue Theme to Zukini Theme but only the background colour of the windows title change from blue to greenish, the rest is still the same.
EDIT:
Sorry I wasn't clear enough, I'm using Unity not Gnome3.
UPDATE: I tried to change with gconf-editor but it has failed to change the windows theme.
1.Window Theme selected in gconf-editor
2.Window Theme shown in gnome-tweak-tool
Best Answer
Assuming u have user-theme extension installed.
Once u switch it ON then logoff and login or
Alt+F2 r
.U should be able to see following menu:
If you don't have user-theme extension installed itself then I advise you to follow: https://extensions.gnome.org/ or I had used http://www.webupd8.org/2011/10/official-gnome-shell-extensions.html
Here are few themes: http://www.webupd8.org/2011/12/satyas-gnome-shell-gtk-themes-ppa.html
http://www.webupd8.org/2011/10/4-beautiful-gnome-32-compatible-gtk.html