I think there may be a way using height fields in Terragen 2. I over saved this landscape over it, but multiple height fields work. They have to be small, with a lot of steepness. Then use a strata shader with a large vertical component, like 750 instead of 200. Adding another strata layer after that gives a nice effect.
Oh yea, the border blending on the height field has to be increased a little. This gives nice shoulders for the columns.
This one's 'mountain' are too long. I'm going to change the displacement so they turn into low ridges. RIght now I was going for the shading/color parts.