Apple Motion 3 - Manual (Page 743)

Chapter 8 Working with Particles 743
 Advance to frame 100. The resulting image now looks similar to this:
7 Apply a filter to the emitter.
In this example, adding the Crystallize filter creates an even more abstract effect. You
might also consider adjusting the color gradient, or applying color correction to make
the background fit more appropriately with your foreground elements.
8 Adjust the Color Range opacity gradient so the particles fade in and out rather than
popping into and out of existence.