Here is an idea, and I don't know if it has already been done, but here goes.

I would like to suggest a Bryce contest in which each entrant gives Renderosity say a small amount like $5 to enter and this is then payed out by Renderosity to the winner (inc. 2nd and 3rd place as well maybe) in the form of a voucher that can be spent at the Renderosity market place. The contest could also be judged by the Renderosity staff or any other way.

What do you think?