The Conversatron is a site which sometimes exists. It is sort of like a forum, but not. I made a few themes for it, in any case, though they were old HTML 3.2 table hacks since I didn't know CSS back then. The only one worth sharing is
Sketchy, though. (I also did the "aqua" one which was the played-out-even-back-then Mac OS X Aqua style, but it doesn't work on today's browsers for some reason.)