Firefox Tee Design Challenge

The goal of this challenge is to create a unique design that captures the essence of Firefox 4. The winning design will be printed as the official Firefox 4 launch t-shirt, a limited edition item featured in the Mozilla store and distributed to thousands of fans and contributors around the world. It will also be highlighted across key web properties like mozilla.com, the Creative Collective homepage, the Mozilla blog, our Facebook page, and more.

Info here.