I've done this on many forums, decided to start it here.
-You must make a thread saying "I CHALLENGE USERNAME"
-If challenge is accepted, come up with rules.
(For example: 15 minute time limit, pre post renders, once renders sent go, k size or unlimited, styles: grunge, abstract, fractal, etc.)
-Must have record in your signature.
-Yea, I'll explain more later, i have to go now.