Outlines Rubber Stamps just came out with new images made just for your Zentangles.... let your pen create one of a kind designs! I was thrilled to get my hands on these a few weeks back and do a three card tutorial over at Outlines on using these. These images would be ideal for paper piecing too! If you a newbie to Zentangles and want to explore, you can find a series of "how to" books HERE and more on the Zentangle Website.
LINK to Outlines where you can see full instructions and stamps used for these these cards.