Jake In Motion shows how to make chunky animated grain in Adobe After Effects easily.
That stippled grain look is famous for motion graphics artists, and if you are using After Effects, there are a few ways to create that type of effect. Jake Bartlett’s tutorial shows how to quickly make chunky, grainy, animated shading.
If you are looking for ways to add texture to motion graphics, it is one of the easiest ways to give them a new personality, and grain is one of the most uncomplicated textures you can generate.
Bartlett has developed a technique for generating a grain that can be resized and customized.
Also, check out this tutorial from TipTuts Matthew Fryer that shows how to make moving grain on a single layer in After Effects.