personally, I've always wanted to shy away from an overly cutesy feel, but then again, I've always been one who favors simplicity
A simple yet effective design with lighter colors has always struck me as a good feel for MSF
The idea of that coupled with some dynamic background elements (pictures in places etc, that change from page to page maybe) is something I could really get behind.
My thought is, we want people to be drawn to the site for content, not because the site design itself is so out there. That isn't to say that unique sites are bad, but for a community/content oriented place, unique is something for features rather than design.
I'll see if I cant mock up some examples to help better illustrate my ramblings