I have a set of 4 from my Finichi Firenze wheels which have a sort of chrome paint to match the silver wheels but the paint has started to flake off so you'd have to repaint them.
Or you could do what I did and buy a set of badges from eBay, the ones I got had a Merc badge on which I've cut out and stuck an insane sticker on. Various colours available but I got some in black carbon fibre.
http://www.ebay.co.uk/itm/200847284318