Well, you used the term skin, and there are a number of skins from Delkin and Camera Armor (any many OEM stuff from China on ebay).
The problem is that everyone that I have seen is made out of silicone. And as you may (or may not) know, this material is the proverbial dust magnet. Heck you got to rinse them off with water to separate the dust from these things.
But, if your gonna be knocking it into things, the do offer reasonable, and low profile protection from dings and scrapes.