This GTK theme engine by David Sansome uses the currently selected QT style to do it's drawing. Basically, it makes your GTK apps look like QT ones.
Please see http://www.freedesktop.org/wiki/Software_2fgtk_2dqt for more information and CVS instructions.
This is a 0.x release - so don't expect it to work perfectly :)
The theme now works in GNOME, and there's no need to edit any Makefiles to get it to compile.