Avoid chromes, brushed aluminums and any confetti vinyls pretty much anything polyester. That is ... unless you want it to go milky after a year or so.
Ultra metallic silver vinyl might work ... but it will darken with age.
I know there is a metallic laminate you can get that is pretty thin ... ment for covering wood construction, but it might be useful. Also I know there is this aluminum covering with an adhesive backing on it ... really thin stuff and I think it has a teflon coating so it doesn't need to be polished ... wish I knew the name of it or where to get it ... interesting stuff though.