More Material Mixer node experiments....but boy, the render times take a hit.
The red one took three hours to render and the rest almost two. I'll have to see if I can trim the node trees and reduce the time, while still getting similar effects.
The good thing about the Material Mixer node, is you practically get two textures for the price of one. The first two images above, are the same two node trees, with their connections to the Material Mixer node reversed, so you can specify which node tree is the background layer and which one is the foreground layer....very cool stuff :)