I am proud to release our new latest style made for vb5 first, Ardarine.
Its background changeable also the header image, without worrying the design overlay on top.
You can just change those image and saved it the same name and location replace the old one.
You can get it here: http://www.sultantheme.com/vbulletin-skins/index.php?page=detail&get_id=447&category=5
or you can buy vb5 Styles SuperPack that will save you a lot of money.