As both a fan of Creative Commons and XKCD the combination is almost impossible to resist. Right now XKCD t-shirts “doing science” t-shirts are available at the Creative Commons store. This is from the CC blog:
The icing on the cake is the most recent addition to our CC Store: this super-cool science-themed CC shirt, for which the world-famous XKCD was gracious enough to let us re-use a variation on a classic cartoon. Many of you may already read and enjoy the delightful webcomic of “romance, sarcasm, math, and language” which is under a CC BY-NC license. Now you can show your love for Creative Commons and science at the same time by buying one of these t-shirts, available for $20 over at the CC store.
Huge thanks to XKCD for being such a wonderful and creative member of the CC community, and for freely sharing that creativity with the world.
Science@creativecommons by Creative Commons / CC BY