Here's a rock but more carfully constructed. Just the same as the last picture I posted but an individual close up. The rock volumetric can be baked out to geometry for export. I haven't tried exporting yet but the baking gets it to standard mesh. This is a very good way to create rocks very quickly. This rock has an overlying color and displacement for detail. The rock item simply uses three levels of noise to form the shape and then you apply matetials as normal.
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As for terrain. i've sussed that. Modo is very good for creating terrains. It has the same procedural power as Blender but is much easier to use. You can create a single poly then add displacement. That's your basic terrain. This can be replicated masses of times with each replication being rotated. It works because you rarely see the repitition. I did the same in Terragen here:
This was a Blender terrain simply repeated. You can see in the top right that the terrain repeats but you would not necessarily notice that unless it was pointed out.
In Modo you can create another large plane to extend beneath all the replications. This acts similar to Terragen's procedural terrain around a heightmap in that it creates background detail and forms around the heightfields.
There are two ways to get th terrain to slope at the edges. One is to create a mask from shaders. Nodes are good for this. The other way is to create a vertex weight map around the edges. For this though, the terrain plane must be subdivided. This option opens up another feature. Once the plane has been subdivided, you can sculpt the geometry underneath the displacement.
I've yet to get to really exploring how a baked to mesh displacement can be handled in terms of mesh optimisation. The meshes I have are too heavy and need culled down but intelligently.
It can all be got out of Modo though for Terragen or whatever.
I've been looking at having a website so I can post about all this stuff. Probably I should just knock up some pages by hand and start putting stuff up and leave aside messing with fancy looks or Wordpress or whatever. I set up an Apache server with Mysql etc on my Linux system to use Wordpress or Drupal but this is probably over the top.This had to be done by hand on Archlinux. Nightmare but at least I know how it works now. No just instaling Wamp or anything that easy.