This is a study in generative abstract tiny code. I started with this dweet which uses an interesting algorithm to fill in the shapes.
r=r=>Math.random()*r|0 X=r(4e3)-2e3 Y=r(4e3)-2e3 v=r(w=r(h=r(500))) x.rotate(t*w?0:X) for(i=w*h;i--;)x.fillRect(X+i%w,Y+i/w,S(t),S(i%v)/t/t)
From there I added more refinements and polish for release on fxhash. I made a tool that will allow you to browse seeds and save HD images.