Modeled, textured, simulated dynamics on each ball, and rendered in MODO, then composited in Nuke.

There are only five "actual" balls within this scene (one of each color), the rest are instanced.

 

This is a revision of my prior post of this, where I addressed the notes I had received from others on ways to improve this. I also re-simulated the dynamics, and extended the length by a bit.