Fractal Related to the Mandelbrot Set
pilex1.github.io
pilex1.github.io
https://en.wikipedia.org/wiki/Buddhabrot
Actually now that I look at it I think it's the combination of the two. Basically, take a grid of points and iterate them through the Mandelbrot function, plotting where they land at each iteration.
(The Buddhabrot discards all trajectories that don't escape. I don't think this one does.)