I managed to get in, and left this message:
On page 26 of your XP wallpapers, you are displaying two of MY works, you have called them : XP24 and XP3, These have been placed here without my permission, and you haven't even credited my company (BoXXi Graphics) with making them. I have successfully sued other individuals and even large companies for stealing my work, and unless the aforementioned graphics are removed from this site forthwith, I shall pursue the same course of action against you. No further warnings will be issued, remove them now, and, in future, seek the permission of the authors of copyrighted material before you display it on your site. Bryan Cook: BoXXi Graphics.
No-one messes with the BoXman