The roommates
Who says that every Christmas card has to be with people you love, it could easily just be a picture of you with your roommates. When you live together with a group of people you need to make the most out of it, in a lot of ways they basically are your new family.
Think about it, you did not choose them (in most cases) and you need to share a closed space with them. So if you are not able to get out to your real family over the holidays, this replacement will have to do. They do not look that bad to hang out with either, the dog is cute.