Also, what is a zentangle?
I also think an enlarged zentangle would be a nice starting point. (Quilting Arts has an issue where they do this for a quilt)
And adding the handstitches after the machine work gives it a final personal touch. So I will sign up for the course. The way the instructor talks to you is like you are sitting in a classroom with her so it is a good substitute for a real class which I can't attend as I live in Holland.