Voronoi cellular noise with multiple octaves and some naive refraction based on the voronoi secondary distance point interpolated using the primary distance field.
Thank you @bookofshaders and @iquilezles.
I would appreciate it, if you end up using this code in any sort of production situation, that you cite me in your code and let me know what you've used it for. I love seeing that people actually get use out of the things that I write, and I don't think it's too much to ask that I get a citation for my troubles :)
This Pen is a fork, but the parent Pen is now private.