The problem with your question is that most of the ROM's that people have made here are unique to the creator. If you want unique to yourself you would have to make your own. You can try Mike's 'project' ROM's for a 'different' look, but you would have to deal with the bugs. Check out that thread for starters.
http://forum.ppcgeeks.com/showthread.php?t=101356
For stability though I recommend the ROM's that are supported though. It's all about preference!