This is a pretty large thread, so this probably has been brought up already, but how about PPV competitions? I'm just a new member so I don't know if you guys did do them in the past or not, but it seems like the only competition going on right now is the sig one.
Basically for every new UFC or MMA card you could set up a competition to make a promo poster for it. I find these competitions work better when there are no size restrictions or any other restrictions. You can see some pretty original stuff.
Another thing you guys could do once a month or whatever is a general competition, like create a cd cover for a band, or a new game sleeve for a new game coming out, or anything like that. Again I'm only new here so I don't know if this forum isn't that active, but I hope it is. I'd love to enter some of these comps.
Also, another suggestion would be to add a new sub-forum called something like "Graphics Battles". That could be the forum for all monthly competitions, and as well we could have a challenge thread, where posters can challenge other posters to matches.
Man, i like how you think.