I am often tempted by a sudden "what if?" idea that pops into my head and stubbornly refuses to leave. In this case, a curious question about tiling patterns using hexagons. This is based on a much simpler square-based pattern, but extends it to hexagons.
The square-based pattern is simple: for each grid square, draw quarter circles centered on either the top-left/bottom-right corners, or top-right/bottom-left corners, with radii of half the square's side. The choice for which set of quarter-circles to draw is made at random. Since regardless of which set is chosen, the quarter-circles meet at the midpoints of each square grid cell, it is seamless, but the random element results in a set of interesting squiggles.
My stubbornly persistent idea was to see what happens if the same idea is applied to hexagons, so I dusted off some tools I haven't used in a while and wrote a bit of code. I even went rummaging for the code I'd written to do the original square version, only to find it was at least as old as 2002. Hmmm.
This isn't meant to be a great piece of art, it's just an experimental doodle. But it certainly satisfied the itch.