Hy!
I made a simple material color randomizer for choosen material id.
Random color, darken or invert the color (based on cookbook)
Works with Blender Render and Cycles as well.
https://drive.google.com/file/d/0B5QQIWH-54S1eUF5dHRYaVM1YkU/view?usp=sharing
Attention: Material Slots (id) are limited to 100 .)
This addon exist already!..search…
It can be. But I had fun to do it myself!
The original script works only with blender render.
My goal was to figure it out how to make it work with cycles.
You find it under polling on the cookbook side:
Py/Scripts/Cookbook/Code_snippets/Interface (added link also to addon preferences)
Always fun to make addon by ourself 