Lisa Volrath has some fun Christmas images that are (kind of) free to use, or you can buy them. It's like an advent calendar of printable goodies.
(These images are for personal use only. That means you may use them in artwork you're going to keep for yourself, give as a gift, or swap with other artists. You may not use any free printable images from this site or Go Make Something for items that will be sold).
Since I give away pretty much everything that I make, I'm pretty much able to use them! Maybe today!