Anyone remember how to draw these?

Oh yeah I could crank out something a lot more baroque with autocad, lol. Has an Escher linotype look to it.

 

You draw a number of adjoining polygons, number of sides arbitrary. Preferably all within a rectangular/square perimeter, just for practicality.

Then within each polygon, you draw a series of interior polygons, same number of sides, touching the outer one, and each corner slightly offset. The offset is arbitrary, but keep it fairly small. It's ok to occasionally reverse the direction of the offset too.

The beauty of it: it's completely freehand and arbitrary, and yet when done seems to be very ordered and structured.

The second pic in post #6 is a fairly simple example, just one of the polygons filled in. Again, the offsets are just freehand, aim to be roughly uniform, but no formula or precision involved.