Case Story Big Bang
I just wanted to let you all know, in case you are interested. capt_facepalm and I are participating in a case story big bang. It is multi-fandom. The story we're writing is Sherlock, but the summaries being posted so far include a Doctor Who/Sherlock Holmes crossover, some original fic, and some other fandoms I can't remember/didn't recognize.
Anyway, summaries are going up here ( http://casestory.livejournal.com/5052.html) and artist sign-ups are open until May 1. It's not all gen fic, but I'm pretty sure there are other gen fics in progress aside from the one we're doing.