How about custom wraps, where a user can upload their own photo?
That could be cool, but I think the way they do it now by having you email it and approve a proof is pretty good though too. It helps ensure that there won't be any surprises with how the final product will look and the cutouts will be where you want them.

and

really would make a wicked combination. Would love to see a black one with just the bat symbol though.
Thanks again!