termGTK is a dead simple gtk theme.
It aims to stay out of the way and tries to resemble a cli environment, so that you won't notice so much you're using a gtk app.
I made it for myself and I didn't test it too much as I'm not using many gtk apps at the moment, but it seems to work fine.
The original source was terminus.
It fits quite nicely with my 2px openbox theme.
See termGTK in action!
24/09/2010: fixed sliders and added an xfce4-notifyd theme.
Please comment if you like it or if you have any suggestion, and feel free to fav'it!