I also like Scanty's idea of designing a tshirt for the forums, and Geoff's idea of designing a logo/motto.
I'm still not sold on the cooking thing. I mean, there are several on our team that can cook, but it just seems like something that's hard to judge on the internet. I know I'd keep tweaking something by taste, instead of going by the recipe, and that's hard to represent on paper. I don't mind doing a cooking challenge if everyone wants one, though.