There use to be a company that had some really nice ones, www.polygfx.com, but it looks likr there not around any longer. They would make custom sized skins for computer cases as well as other stuff like Ratpadz skins. Other than them I dont know of anyone that does what they use to which is a shame.
I remember someone already tried this. They had skinned the stacker 830. Don't know how many he sold but maybe you can contact him. Here is the thread he started.