Where can one find cool website designs online?

google Sites is pretty simple and certainly neat and ad-free, but it's fairly limiting.

There's always Angelfire, but I haven't ever tried that.

Freeweb's probably still floating around somewhere.

If you want to make a wiki-style site or even use the wiki format to your advantage, I highly recommend Wikidot. It's relatively simple to use and they've got tutorials for almost everything.