I like the grunge style used by Vikes and Joshyboy. Very nice.
Defianthart took a unique route with the two players in the front actually playing, and then their faces in the background. Turned out very well.
Flockers' techno look (with the little boxes) were very nice and a great sig. But I think he mispelled Double Trouble
Deluxe and SPC took similar routes with the blurry, sort of mystical look and those are my personal favorites. Neither are too complicated (1 player) with the team logo in the background. IMO, the best sigs are the simple, yet effective ones. Those two are my favorite. But I'm not telling which one I voted for