Karl Sims, of course, is The Man when it comes to reaction diffusion eye candy. Try his RD tool, and click on the Example button a few times to get an idea of the visual effects it can produce.

https://www.karlsims.com/rdtool.html

He's also got a great tutorial. I relied heavily on this while writing mine.
https://www.karlsims.com/rd.html

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#ReactionDiffusion #KarlSims