So, I did end up coming up with an idea for our Christmas cards last year. I Simpsonized us. I created different Simpsons avatars for each of us, then pasted them (along with the background of The Simpsons set) together in Photoshop. Then, I had 5x7 photos printed of it.
(Click on either of the images to see a larger version of it.)
And then on the back, I just printed out the following text and taped it to the back of the photograph: