This is one of my favorite implementations of the particle emitter component. In it, a gently rolling particle field of colored discs drifts slowly across the screen.

In this example, the ParticleBody actually consists of many frames. Eacah frame contains a disc of a different color. Code on the first frame of the ParticleBody tells the Movieclip to randomly gotoAndStop on one of its frames.

There is a special feature with this example that you may notice only after some time of observation.