From the Threadless Site:
In anticipation of Earth Day 2009, we’d love for you to let us know what being “green” means to you… in the form of an awesome tee design, of course! Is it a cleaner environment? Sustainable resources? Renewable energy? Global responsibility? All of the above? Or maybe you have some other ideas… We’d love to see em! Your challenge is to create a design based on the concept of thinking GREEN!
Find out more about the Threadless Green Challenge.