This is a very good object. I looked quickly at the rest of you site. Your tutorial on object scale is very good. The grids are really a good idea. It would be nice if a scale grid could be added to Terragen 2, with adjustable grid spacing.
Thanks for the post. I did not include an object with my tutorial, since part of it was how to make stones using Blender. Your object/s will make great additions to peoples renders.