Height/Slope Blending

I wanted to do something a bit different than the standard mountains with snow on them for height blending. So I made this volcanic environment.

I took a height map from Google Earth of a canyon in Egypt and another of a volcano and blended the two together. Then I made textures for obsidian, a red glowing obsidian type rock and ash for the top.

Here's the material editor for this. It looks like a lot but really it's the same thing repeated for the spec, normal and emissive channels.

And a close up.

Here's the material for the lava surrounding the volcano.