Hi Mark, Nice tutorial.  Question:  Why not just use world mapping as the default for all of your nice textures?  This does a couple of things:

1. It would normalize the appearance on any type of object used, regardless of shape, without having to change the mapping mode

2. I would provide unique variations of the texture depending on where you placed the rocks - this is desireable for example when creating ecosystems

Under the world mapping scenario, the only thing you might have to adjust is the scale

Lovely textures however.  A must have for Vue.