And here are the material room settings, you leave out the part for the red veins and attach a skintexture to the white colour of the first blender node.

The idea was based on a baggingsbill shader for dried mud, which can be found in the Node-cult forum of runtimeDNA.

Best regards,
Bopperthijs

 PS. Of course it can also be used as creepy zombie shader!

-How can you improve things when you don't make mistakes?