Took a class from my LQS many years back. I then appliquéd 20 blocks with different Celtic knots. At the time I made 3/8" bias "stem" strips tubes from 1/2 yard cuts. Now as I know how to make continuous bias I might do it differently. I sewed them down following a traced pattern, with white "tracing paper" onto black background. New strips were adding starting underneath as u crossed under a knot. Just start so that you are stitching on the inner curves 1st.
I still need to finish this quilt. I have an idea in my head just need to get it out!