How are you planning on reproducing the wallpaper if you find some you like?
I recreated the wallpaper from The Haunted Mansion, and making a Christmas version of it would be fairly easy, but you would need to either paste lots of smaller sheets together or have a large format printer to do it in one or two pieces. The original background is a purple gradient, but it could be changed to a green gradient, and put the santa hats above the various pairs of eyes.
PM me if this is of interest.