This is becoming an annual tradition on our house. I donate enough money to Creative Commons to get the new cool t-shirt. I evangelize about CC. I take a "two-headed t-shirt monster" photo of my kids. Enter it into the CC Annual Swag Photo Contest. It's a fun way to support a cause. Last year we won!
And I would be totally remiss if I didn't include the Creative Commons fundraising widget and urge you to purchase some swag and enter the contest. But wait until next week because I don't want anymore competition -- there's too many great photos in there already.