Blah..
Just coz the wallpaper is something made in his style, doesn't mean we should all go around stealing his idea, and just making something apparently better. Its called stealing peoples thunder. He had a nice idea, and has carried it out well. Just because the image doesn't suit doesn't mean we should all make him feel bad by making some that are 'better'. You could give him some advice on what sort of dtyle you'd like to see on it.
and tbh Hobbes, that is rather plain..