My thoughts ran to angles in stitching and here are a few samples.
thick and thin
smooth and knotty
dressing it up
knots on the straight edge
and knots on the angles
Oops, there are a few mistakes in this. I like the impression not the details. With better spacing and stitching I think this would work nicely.
Now for a more delicate look
that still has lots of angles using Perle 8.