Most people go with either the polyurethane or ABS plastic ones. I'm not sure about the ones you're wanting them to make for you, but most of the vinyl ones you can buy are real thin so they don't seem to match the body very well i.e. hood/fender sticks out much further. Also they don't seem to last very long.
i used to use that static tint stuff cut down into the shape of an eyelid. I liked it...then I got some cheap carbon fiber ones...and I liked them better. lol silver is a tough color...did you ever think of doing them in black? sometimes that's easier. and the two tone might look good.