https://en.wikipedia.org/wiki/Worley_noise

Can this be trivially implemented with the appropriate parameters for crackle,
or is it more involved?

Looks like it's a great function for use in landscapes and other scene elements:
http://procworld.blogspot.com/2011/05/hello-worley.html

https://aftbit.com/cell-noise-2/
http://www.carljohanrosen.com/share/CellNoiseAndProcessing.pdf

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