Oh, yeah, tons of fandoms I don't know - and then there are the ones I know, but writing them would be a high-wire act, and I'm impressed that other people are offering them (see above re: Willis, again).

I really recommend doing it, if you feel like it, and if there are enough fandoms there to interest you. The writing is fun (or terrifying!) and of course, getting a story written just for you is part of the appeal.