I forget how I managed to stumble on Dr. Seahorse (a sythn-mazing collaboration between Trevor Davis and Mark Suhonen), but I'm so glad it happened.
I've been really interested in collaborations recently—I would love to explore that. One avenue for designers (and musicians, songwriters, poets, writers, illustrators, filmmakers, etc) is the project HitRecord. Artists upload their work with the intention and expectation that somebody else on the site will download it and add to it or change it or use parts of it for something else. Really fascinating concept—and seems to work quite well, as they've been pegged to work with companies even as big as Levi's.
P.S. Trevor Davis is currently a contestant on The Voice. Is it too hipster of me to say I knew about him before he was the next big thing? ;-)