Upgrading from 11.04 to 11.10 did away with my themes, without warning me. I can't seem to find any way to customize the themes (short of going into theme files and messing with those, and I'm not quite ready to do that yet). And I can't find any themes online. I'm not enjoying Ambiance, or Radiance, or any of the ones offered by default.
Where can I find themes for Ubuntu 11.10?