The After Effects: Effects A-Z tip series from Motionworks continues with guest host Adam Everett on the CC Ball Action effect that ships with After Effects. Beyond the basics he shows the Brightness Twist control, an old favorite that can make things interesting.
A number of other tutorials on Ball Action for light walls and audio viz have been cataloged at the old AE Portal, along with a complete list of the Effects A to Z series. An oldie on Ball Action may seem familiar, Molecule fun by Stephen Schleicher.