Get a load of these little sausages:
http://www.vterrain.org/Packages/Artificial/
The Grome one looks like it might just be top sausage:
http://www.quadsoftware.com/index.php?m=section&sec=product&subsec=editor
Which I hope means it auto-makes and textures a terrain for you.
http://www.vterrain.org/Packages/Artificial/
The Grome one looks like it might just be top sausage:
http://www.quadsoftware.com/index.php?m=section&sec=product&subsec=editor
Procedural creation of geometry using fractal algorithms and natural erosion, procedural textures, creates shadowmaps, distribute objects including vegetation
Which I hope means it auto-makes and textures a terrain for you.