If you use Blender, "give your textures and models a knitted yarn look" with the new "Wooly" shader that makes anything fluffy. A shader changes the surface appearance of an object or scene; procedural refers to a programming technique that creates a convincing illusion of natural or random origin. Here's video of it in action:

https://boingboing.net/2020/08/31/wooly-shader-makes-anything-co.html