Multi line brush that works for drawing knots!
I made a brush with three dots, the middle one being bigger. I did have to clean up the points of this drawing, but the brush did so much of the work:
I made a knot and tried erasing carefully, and filling with color for an over under look:

Created eclipses that I colored in different ways then made more complex shapes of them:


Also created a just double brush which I plan to use on many knot work drawings in the future, but here are some experiments:


