If you look at my previous projects, most of them are fractals.
I made this so you can try and make some for yourself!
The process if that you make a 2x2x2 cobblestone "seed." The seed then turn it's blocks into the shape of the seed itself. This process is repeated again and again.
This is called a 255 fractal because it can generate 255 different fractals. (Excluding mirrors, rotations, and the empty state)


Up next, the 134,217,727 generator. :P