I did one of these and lost it somehow a long time ago. Imagine that. This is a surface layer with altitude constraints, the FSS and a powerfractal. I adjusted the RGB to vary the colors of the rocks. Finally sort of getting these nodes where they are supposed to be linked. (Examine every little box....duh)
And this would be the TG I remember. I guess the quality limits and size restrictions with free version make a difference, but it is still fun to take a challenge.