There's one that I've found that I thought was really well done:
I love the song, Christmas Time by Will Heikoop & Maya Filipič used in this video. A search for a downloadable version brought me to the badgerland site. It's a neat site that allows musicians to get their songs out there. Some are really neat and others aren't to my tastes but it's a fun to listen to all the original songs and the individual interpretations of some of the mainstream songs.
I got quite a kick out of this one: Kristi's Surf Christmas