Church Media Design has developed resources for creating looping backgrounds and so forth in After Effects. They've also covered compositing and keying basics as well as topics like Shape Layer Expressions and Masking Inside Shape Layers. Here's an example, CMD 81: Looping Backgrounds: Particle Effect (if a foreign sound to your ear distracts you, just skip the first few minutes of church chat).
Beyond these and built-in background presets, Motionworks has history in this category, and AE Help discusses how to create a seamless loop using Fractal Noise, as does Adobe's Bob Donlon (but with pictures) in Some Background Information.
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