Sufjan Stevens' "Songs for Christmas" is by far my favorite. Basically, the collection is composed of 6 discs that he sent out yearly (2001-2006) as Christmas cards to his friends. Well, the first 5 were private and the last was meant for release. Anyway, his compositions are original and utilize many instruments (often the banjo). I can't access youtube at work, but you can search for "sufjan stevens christmas" and come up with a few good ones from the album. Enjoy!