Yeah, Genesis looks pretty crappy. I kind of like the trippy rainbow of Famicom games, though. :P

Sega CD games look really nice lined up. Pretty blue. :) However, the original cardboard ones break the consistency. Loose NES is also a favorite of mine, as is loose SNES.

I'd say loose Super Famicom and N64 are some more crappy ones. They look stupid unless they're in boxes.