I've fixed the head/base images for you. There are 3 different inputs for head/base images for those who wish to have their forum as a percentage width of the users screen (Rather than as a fixed width). So it's fine to leave the right hand side ones blank and to use a blank image as the center one. (Having a look at what I've done might be best).
Also on the Christmas skin I removed the background images for the window 1 and window 2 areas as they were making it unreadable. If you are using a background image for this area I'd recommend something a little plainer which allows the text to stand out still.
Let me know if that's all OK now
