It’s not up to my normal standards for posting to the patterns library, but it seems to be working!
I threw in a 1D render() for you to try out as well.
Note that I think most plasma effects, including the one you posted, will be cycling a thinner stripe through the Perlin’s height map output. I’m only cycling hues through it, then panning the viewport through the noise in a circle.
It looks good on your 2D LED matrix but not so good on a strip. Might look better with a denser 144/m strip but with the gaps in my 60/m strip it doesn’t look smooth. The pattern on the strip just kind of sloshes back and forth, which makes sense looking at the 2D matrix. I had some fun messing with your code but never came up with anything good. It may not be possible to get a good plasma on a 60/m strip. I did enjoy digging into your code, I learned a lot. Thanks for giving me so much code to tinker with.