I have a skin sample for someone who asked quite a while ago if you are interested http://www.turbosquid.com/FullPreview/Index.cfm/ID/232807 the file at the bottom that says skin_psd.zip -the other one doesn't have layers.

If you use that as a basic idea or even just add some new color layers to make the skin hue more blueish that might do it. You can mess with the opacity settings of the layers and you'll see you can change the skin texture a lot just that way from showing it more grainy, less/more veins, show a sample scar and bruise etc.