What It Is
A toy add-on that generates and assigns random colors for each face of a mesh.
The tool shows up in the 3D view's tool section.
WARNING: This can potentially generate a LOT of materials in your project.
Make sure to keep track of the number of unused materials.
There is button called "Remove Unused Randoms"in the tool section which will get rid of any of the randomly generated materials so long as they aren't being used on any mesh.
Use it to avoid building up too many materials.