I have seen Celtic knot fonts on the web. Celtic knot patterns are made by "tile" typing the fonts. It got me thinking it would be a cool thing to do for the CW with small patterns on the snap grid.
I made a basic knot with vectors and bubble. Made a pattern out of it and then chopped it into smaller square patterns. I did this by moving the big pattern around on a small square board. Only the part of the pattern on the small square board gets made into a pattern.
By copying, pasting, and moving the pieces around, one can make more complicated knot patterns. Give it a try. (I am not sure that the bubble produces a consistent enough height profile so that all combinations have smooth connections. I have seen some lines which may be real or just be the display.)
I think this technique has some potential.