Like Dakine I have the metalcast blue anodized paint on my calipers and engine bay. Looks really good on the calipers but I am slowly changing everything in the engine bay to a new color scheme(color coded blue with silver/white accents) and I am going to leave the calipers anodized blue(cause it looks pretty pimp) but may eventually switch over to gold calipers.
Personally I think red calipers are overdone. And when your doing something to your car so you stand out I prefer to be in the minority than the majority. I am actually trying to find specs to see if Jaguar calipers would work on my car since I could probably get em for free. some nice brembo silver calipers would be pimp. Otherwise blue for now, maybe gold later.
edit, I also have blue anodized stem caps for the valve stems on the tires, just some ichibahn caps I found on sale for 4 bux so I got em and they match almost perfectly to the caliper color.