The newest is strangevisitor7's Hanukkah present from last year. she wanted an Ezra Christmas fic, and this was what I came up with: A Quarter For Your Shoe. It also ended up being a runner up in the Mistress' of Malarkey awards this year.
I'll Be Home For Christmas, which was a Methos/Triona story I wrote in 2007. It contains the infamous red and green tapas. Would I lie?
2006 was The Silent Stars Go By, which is set in 2065 during WWIII, and manages to work in a few references to Monty Python and the Holy Grail. And it was a two story year. There was also Fathers Christmas, which features Methos and my 'original female child' Lucia. It's set in the 24th century and involves ponies and magic cookies [g]
Then setting the way back machine to 1996, my fist Xmas story, and my very first posted fic ever, A Ghost of Winter's Past. This is still by far the most popular story I've written. I still get a few comments a year on it a decade and change later. Methos visits his 'nephew' Lucien LaCroix in Toronto one Christmas Eve, spreading definitely most unwanted holiday cheer.