Alright, I don't know most of your religious affiliations, so I won't make the Dec. Challenge purely about Christmas. You have options.

Prompt One:
Reinvent the Wheel: Take a classic and make it modern, different or just plain wierd. Fanfics and original work are both accepted.
Must Include: A recognizable plot. (i.e. A Christmas Carrol must include Scrooge.)
Point Value: 10

Prompt Two:
Christmas Wrapping: Write a holiday story, original or fanfic.
Must Include: Wrapping paper, the colors blue and gold, and the lyrics from your most beloved holiday song (beloved is a loose term. Grandma Got Run Over By A Reindeer would suffice.)
Point Value: 10

Prompt Three:
NaNoFiMo: (AKA:I know which prompt dzd is going to pick) If you chose not to WriMo it up this year, or did but couldn't finish, take part in NaNoFiMo (National Novel Finishing Month).
Points: 1 for everythousand words. 50K? 50 points. NaNo-ers, count your total word count. If you hit 80K in 2 months, you deserve the 80 points!

Pick your poison, kids!