Trapcode Tao training

Photorealistic snow with Particular

Fantastic results in this tutorial on creating snow with After Effects and Trapcode Particular. 

Mir Thing Tutorial

Here's the final clip we'll be re-creating:

Tutorial on creating the above:

Using Trapcode Mir v1
For finishing touches also uses Trapcode Shine and Form.

Covers setting up the "spikey" shape using an amplitude map for the fractal. Also shows the "finishing"; creating the background, light-rays, shadows, glow, atmospheric particles etc.

Vine Growth with Particles Tutorial by School of Motion

Excellent tutorial by School of Motion. Covers a lot of useful techniques.

Low Poly Mountains with Trapcode Mir by VinhSon Nguyen