Go to the model shop and buy a model car with a shiny cap (radiator, gas, hubcap). It would be an expensive cap, but ...
How about a fuel dot? I know I've seen shiny aluminum dots.
Take a trip down the makeup isle at the store, you just might find some doodaad that'll fill the bill (and put a little color in your chee, ah, well, nevermind).
Listen to your inner child and don't forget the toy isle at the local discount mart. GI Joe just might have what you're looking for.

Scott