You might want to look at some of the vinyl wrapping films that are out there now. 3M 1080 film comes in a heap of different colors and finishes. It looks pretty easy to cut and apply to a small area like a stone guard.
http://multimedia.3m.com/mws/mediawe...1qGd1q111111--
Looks pretty easy to apply.
This is something I've been considering for a while to finish the whole car in.
Cheers
Michael