Add noise variation to color

[buckle2000]

Current colors are too uniform.

Maybe we can add random variation in addition to the palette and create something like this:

[qrohlf]

@buckle2000 the library gives you the tools to do this, just pass in your own color function. Demo: https://codepen.io/anon/pen/GMXMox

[buckle2000]

Noice! Thanks for your work