Effect

I learned this from flickr member, Juan (www.flickr.com/photos/juanjoispolo/). This is too blurry. Here's how I do it because I'm limited with CS3. And you can play around with these steps.

 

Duplicate background layer. Desaturate it.

Filter>dust and scratches until it looks right. Lower to 50% opacity. IF YOU HAVE CC USE THE CAMERA RAW FILTER AND PUT CLARITY AT MAXIMUM.

Duplicate THAT layer, blending mode Saturation.

Use layer mask to bring out color.

Done