I like the format. Seems like a challenge that might get some more intrest. Does it need to be limited to 16 now that you have such a fancy voting system? I would think you could allow as many entries as you could want?
I think the original reason for limiting these sorts of challenges to 16 was so that voters wouldn't have a plethora of almost the same image to look through. I think that's still a good idea.
So instead of increasing the number of max participants per challenge, if a challenge fills up I'll just post more challenges.
Looks like it's gaining momentum. Might help if langdon added it to the Community Projects page... wink, wink. =)
I see there's a new PPChallenge up. Wish I could do this one but time doesn't permit this week. Sure do want to see what everyone else does with it. It looks like a nice image to work with.