If that's the case, why not do a piece on what you know best (comics, obviously). There's gotta be more christmas issues that are ripe for mocking. OR you could do something on the X-Men animated series episode with the morlocks and christmas.
Edit: Here it is:
http://en.wikipedia.org/wiki/Have_Yo...k_Little_X-Mas. If you want, I have the episode on disc somewhere and I could probably send it to you over aim or something as it's just a vhs rip and is therefore a pretty small file :O