Just so you know (someone else may have notified you already) - Yuletide Madness, in which all prompts are loaded up for anyone to write quick-fire bonus stories and upload them to the archive - is now open to anyone with an AO3 account, not just Yuletide registered participants.

This is not QUITE ideal since the AO3 is still in beta and you need an invitation - but if you think you might have spoons to spare on writing fic on Christmas eve, you can head over to the AO3 now and I believe they have a form for requesting an invite.