Last night, I took a mini-class with the A.R.T. Yahoo group. It was a web-cam class. There were some technical difficulties but it I still got a lot out of it. I am hoping that I can teach this to my kids at school. The concept is very interesting and I had a lot of fun doing it. Here is the link to their site: http://zentangle.com/index.php. The concept is actually very easy even though it does not look that way. Materials are relatively inexpensive and you can carry it around with you anywhere.
The size is 3.5". It took me less than an hour to do this whole thing with the shading and everything. I fit the class in and finished it before the season premiere of CSI came on. It really is a lot of fun!