My first attempt at writing a Renderman shader. The shader is basically an elaborate mosaic/grid texture. In the image above, it has been used on a displacement channel.

Here's the MTOR Slim interface to it :

It has built-in filtering, color remapping, voronoi jittering, grid linewidth based on texture luminance etc...

Drop me an email if you want to test this out.

Here's some more variations on the same theme :

Check out an animated version of the top image here (1MB, DIVX). I used a video sequence of clouds as the base file texture.

And finally, here's another image I made with it :

More Renderman stuff to come!