During my studies at ACCAD I have written quite a few RenderMan shaders.

After Graduating I no longer had access to PRman, and played around with BMRT for a while. These experiments involved Ray Marching

The image on the right was created using BMRT 2.5 on Linux

I have mainly been working with Softimage XSI / Mental Ray lately, and not done a lot of Renderman related experiments. I have started writing shaders for Mental Ray, here is a Non Photorealistic Rendering test.

Recently I have been tinkering with the Renderman Compliant renderer 3delight on my Macbook.