ThinkGeek and Instructables are running a contest: use any ThinkGeek product to create something wondrous, publish it on Instructables, and enter to win a $250 ThinkGeek gift certificate for the best mod. Two first prize winners will each win a $50 gift certificate and an Instructables Robot t-shirt. Runners-up will win an Instructables t-shirt. Deadline is March 29th.

ThinkGeek Hacks Contest