Not really a contest... Because the only "prize" is having the winning icon used!
From what Ive read the icon size is 100 pixels wide and 50 pixels tall.
RULES: (I may make acceptations to these)
* Do not use this as an opportunity to show off your cosplay. (Not sure If I want cosplayers in the actual picture or not.)
*Do not use anybody's pictures without permission!
*Obviously no nudity or profanity.
*Try to fit in at least TF2 cosplay.
Aside from those things, have fun and be creative.
Not sure about a deadline, perhaps by new years.