I've managed a number of Christmas-themed strips over the years, many related somewhat to mathematics as it's a school-based comic with a heavy math theme, but I like all things geeky, so science and English (with doses of Shakespeare, Dickens and Monty Python) work their way in.
A few years ago, I ran out of time before I could do a strip and I almost forgot to do it the following year. Last year, I just kept putting them up through half of December. Why save Christmas ideas for 10 years if I might give up the strip next July?
Anyway, with varying degrees of hits and likes among the readers, here's the Christmas tag from my blog. (Feel free to like, share, upvote, +1 or whatever your persuasion.)