oh...was gonna suggest Blender (one of the few things I can actually do with it..;) free, and I have a greeble (discombobulator) tutorial in Tutorials.

Somehow with an all-Bryce solution, the word 'replicate' is likely to come into the conversation..;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)