I had my detail guy paint the rotors and calipers with Wurth Silver Paint.
http://www.goodspeedmotoring.com/aer...paint-kit.html
Your rotors can look pretty bad if not painted, mine already had a very unattractive coat of rust. I don't have pics right now, but I will say that having the rotors and calipers painted to match the wheel color is understated, but it looks pretty good.