I think it would be nice if there were official foldit desktops. I have a makeship one (see attached file) but it isn't very good, especially when blown up. Most programs, Cds, etc. have them, so why not Foldit? If there are t-shirts, why dont you have these? It shouldn't be too hard to do, and it would be nice to have.
This is an area where the community could likely do much better than us. I'm sure there's more than a few graphic designers out there who double as Foldit players.
There are tee-shirts available…
Please see this post (which is a sticky at the top of the forum) http://fold.it/portal/node/991221
Katfish just posted some here: http://fold.it/portal/node/994417