Tutorial based on gallery item

Does anyone know if there’s an example or tutorial for this kind of terrain in WM? http://www.world-machine.com/gallery/index.php?page=0&sort=recent&entry=108

It’s amazing! Which colorizer was used?

Not exactly that peaks, but very similar : http://www.geekatplay.com/world-machine-tutorials.php

I didn’t color that in WM. In fact I never do. I just create a splat map and use it in my shader to distribute materials per channel.