Zentangle
"Zentangle is an easy to learn method of creating beautiful images from repetitive patterns. It is a fascinating new art form that is fun and relaxing. It increases focus and creativity. Zentangle provides artistic satisfaction and an increased sense of personal well being. Zentangle is enjoyed by a wide range of skills and ages and is used in many fields of interest." -- Zentangle creators Rick Roberts and Maria Thomas
I found this great website, The Bright Owl, that gives weekly challenges and here's my first attempt. The template was this
... and here's what I came up with: