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Fandom stocking!
I had a lot of fun last year writing ficlets for people's stockings, so I decided to ask for one myself this year. :D It's not too late; I am fairly sure that you can continue to sign up even once the stockings start to be posted. Rules etc. at the link (and examples of other stockings). And if you're hunting for stockings to fill, all of them are tagged by fandom. (Keep checking back; they're still putting them up and probably will be at it for a number of days yet.)
Also,

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It would certainly be possible to start one, but this might be a lot harder to get off the ground than, say, a simple mono-fandom exchange, because it looks like so much work on the mod end, and requires a fairly large community in order to work. (And no, I am not volunteering. *g*)
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