I think I've seen similar textures on cave walls. But it's basically a diffusion-limited aggregation shape. A good few examples here: https://en.wikipedia.org/w

I think I've seen similar textures on cave walls. But it's basically a diffusion-limited aggregation shape. A good few examples here: https://en.wikipedia.org/wiki/Diffusion-limited_aggregation https://en.wikipedia.org/wiki/Diffusion-limited_aggregation