Well, for Christmas dinner that is traditional but uncommon, why don't you roast a goose?
At our house we always had Christmases that were very heavily influenced by German culture. There it is traditional, at least where my parents came from, to roast a goose for Chrismas dinner. It's not a bad tasting bird and they are available, if a bit pricy because they're not as popular as turkeys or hams. Red cabbage braised in apple cider with cloves and a bit of cinnamon is a good side dish along with potato dumplings and gravy. Unfortunately I don't have a formal recipe for the red cabbage, I play it by ear the way my mom always did, but it IS a different, slightly sweet/acid flavor that really complements goose or, even better, game such as venison.
For Christmas, though, I always dream about the cookies, the music and marzipan (YUM YUM YUM ! ! ! ! I love that stuff) - usually in the form of a pink little marzipan pig.
Ach, now I got started and I can't stop dreaming of Christmas!
hugs & smiles,
helen