Here is what zentangle.com says about zentangles with some samples following:
Our Zentangle method is a way of creating beautiful images from repetitive patterns. It is fun and relaxing. Almost anyone can use it to create beautiful images. It increases focus and creativity, provides artistic satisfaction along with an increased sense of personal well being. The Zentangle method is enjoyed all over this world across a wide range of skills, interests and ages.
We believe that life is an art form and that our Zentangle method is an elegant metaphor for deliberate artistry in life.
Of course, from this site, I went to amazon.com to see if there were any books on the subject. And, to my delight there were several. Here's what I got:
Sad to say, I'm a bookaholic. I guess that's not the worst thing. Enjoy the zentange Web site!