The Noise generator creates a random, colored static pattern. To make animated noise, you can keyframe the Random Seed parameter in the HUD or Generator Inspector. When filters are applied to an animated Noise generator, you can create unique textures. In the second image below, the Stripes distortion filter is applied to an animated Noise generator to create a vibrant, electric light-type texture.
Adjust this generator using the controls in the Generator Inspector:
Random Seed: A slider that sets a different noise value. Modifying this value over time yields a constantly changing noise pattern. The easiest way to see and use the Random Seed parameter is to add a Ramp behavior to it (in the Parameter behavior category), then ramp from a very small random seed value to a very large random seed value over time.