Whoa, love the "hot re-loading" on edit. It's super fun but as there's no undo, kind of live coding with no safety net.

I use Inigo Quilez' Graph Toy as well. I figure combing the two into a pipeline, one to generate interesting looking (implicit surface) functions, and one to visualize them in a voxel system with monte carlo rendering is sort of the viz tool I'm evolving toward. Shader toy requires so much code for rapid prototyping because everyone has to constantly re-invent everything from scratch! It's a unified shading model sans standard lib ;)