During my recent trip I learned several new techniques for tangling. One of my favorites was this one called "Zero Drawing" taught by Meredith Yuhas. Simply, it involves creating your own toned paper with graphite and then erasing the design area using a stencil and a fine tipped Zero eraser. More information on this technique is available in the book Pencil Magic by Marie Browning.
This technique was lots of fun to use to add tangles to. I had fun choosing the tangles and then decided to leave several sections without tangles to leave a place for the eye to rest. A liile extra weight to the edges with heavier pen lines and I was very happy.