Shattuck is one of my most favorite tangles. There is so much flexibility. I like to draw it as a more organic, plant-like shape, but if you do it flatter and straighter, it looks more basket-woven-ish. If you "mess-up" the back and forth weaving pattern, it still looks cool! And try having your rainbow arcs meet in the center, instead of near the veins, and you get an amazing braided pattern.