In 12.04 I used Unity and was able to change the theme with the gnome-tweak-tool.
Since the update to 12.10 I use gnome and try to change the theme however nothing changes except the top bar which I changed in a different way.
I applied the theme with the tweak tool and I logged out and in again, I even tried it with restarting the PC and that didnt work either. I hope You can help me.
Sorry dont know how to put the picture inside -.-