I can fully attest to the "zen" part of Zentangling! I combined my Easter crafting and decorating with my relaxing and winding down time by making a Zentangled Easter egg using the Zentangle tutorials in One Zentangle A Day: A 6-Week Course in Creative Drawing for Relaxation, Inspiration, and Fun.
Click on this page from One Zentangle A Day to learn how to draw the Shattuck, Nipa and Jonqual Zentangles. I used a plastic egg and a fine tip Sharpie. It was a little slippery, but I wasn't too worried about perfection; I was simply enjoying the experience of following supper easy and clear directions. I am really happy with my Zentangle Easter egg! I keep spinning it around in the egg cup to look at it from all sides.
More about the Quarry book:
One Zentangle A Day is a beautiful interactive book teaching the principles of Zentangles as well as offering fun, related drawing exercises.
Zentangles are a new trend in the drawing and paper arts world. The concept was started by Rick Roberts and Maria Thomas as a way to practice focus and meditation through drawing, by using repetitive lines, marks, circles, and shapes. Each mark is called a "tangle," and you combine various tangles into patterns to create "tiles" or small square drawings. This step-by-step book is divided into 6 chapters, each with 7 daily exercises.
Each exercise includes new tangles to draw in sketchbooks, teaches daily tile design, and offers tips on related art principles, and contains an inspirational "ZIA" (Zentangle Inspired Art) project on a tile that incorporates patterns, art principals, and new techniques.