Changing Background Colors

I found some really neat photos where there are color patches in the background...it almost has a watercolor effect to it. I was wondering if anyone knew how to create this effect in photoshop. Here's what it looks like:

http://www.exterface.com/skywalker/

THANKS SO VERY MUCH!

Flip dude,

I would suggest playing around with the "lighting Effects" in the Filter/Render/Lighting Effects,

And under the "Style" drop down, choose a 5 light option or something to that effect.

Thank you so much for the response! I will definitely try that!