This is exactly what it sounds like: I started playing around with Processing and Processing.js, and I'm having fun and want to share.
To see my favorites, visit http://kenbellows.github.io/processing-experiments/ and select a sketch from the dropdown at the top.
My absolute favorite so far is galaxy-swarm. Give it a minute to get going; it swirls up into vertical vortex encasing the Great Eye, then emerges the FSM himself in all his noodley glory. (I stumbled upon it due to a typo in my attempts to create starfish_and_roses.)