The Stevedore knot is another stopper knot. It’s tied very similarly to the figure eight but with an extra wrap around.
As I was doing more of these, I started playing around more with using multiple markers on a color ramp fed by different textures to get the interesting patterns. This is another one that is an experiment with displacement. For the background, I played around with stripes. Both stripe patterns are on a gradient with the stripes controlling which one you’re seeing.