UI Wobble Shader
A shader that will a add a bit of liveliness to your UI is always a good thing, especially when you are making a mobile game where grabbing and holding user attention is top priority.
Jiggly Wiggly UI
This effect is known to hypnotize users into spending big bucks in your game (sarcasm). Anyway this shader is based on the optimized UI shader provided by Unity.
This optimized, mobile friendly UI shader can be found HERE.