I have always found the topic of Raymarching signed distance fields a fascinating method to generate images procedurally, with infinite resolution. I followed some of The art of Code’s youtube videos to learn my way around the principles, and implemented the effect above in shadertoy link
I expanded a bit on the tutorials by implementing tri-planar texture mapping, and different texture IDs are returned as part of the raymarching loop, based on metadata in the scene objects.
Another example of raymarching I explored was modelling an item (as part of Genuary - the procedurally generated art monthlong prompt jam) link