A year ago I discovered  a set of very nice repos by Keijiro Takahashi. He is a great Unity contributor.

There is some great post-effects repos, but for me the most interesting part is procedural geometry effects pack named KvantSuite. 

There is also a lot of fantastic stuff for realtime music visualization.

Here is list of my favorites:

• https://github.com/keijiro/MidiJack If you want just like me  use your midi controller in Unity, here it goes.
• https://github.com/keijiro/KvantWig Non-realistic hair simulation
• https://github.com/keijiro/KvantSpray GPU particles
• https://github.com/keijiro/Skinner Geometry effects for skinned mesh
• https://github.com/keijiro/KvantSwarm GPU flowing lines
• https://github.com/keijiro/KvantGrass GPU grass
• https://github.com/keijiro/KvantWall GPU object array render
• https://github.com/keijiro/KvantLattice  GPU fractal terrain
• https://github.com/keijiro/KvantTunnel GPU fractal tunnel

Take a look, it’s awesome:

Skinner usage example by Keijiro Takahashi