You could win some cool cash and get your design worn by all the cool kids.
From the announcement:
WeLoveFine.com is calling all Munchkin fans! Its time to kick down the door and grab your trusty arting tools because WeLoveFine is proud to announce their first ever Munchkin Tee-shirt Design Contest! All winning designs become official Munchkin merchandise. There are signed games and cash prizes to win. The Grand Prize winner could receive up to $1000 cash!