i picked up this little Toma mood polish (which no longer changes colours) for $0.50 from a local nail supply store. it's a translucent grey base with different sizes of silver glitter that when layered gives the look of a foil. i needed 3 coats (and could have done a 4th) to achieve full opacity. it would have looked good layered over black or grey too. i like this polish a lot though--it's a nontraditional silver.