I have been doodling a bit with the help of the Zentangle's books. They teach you how to doodle. Here are a couple of my projects. These are drawn in a 9" x 6" book.
Here are a couple links to check it out. The first one is the Zentangle blog and the second one is Judy's blog about her drawing and Zentangles.
It is fun to do and kind of relaxing. As you can see I haven't learned how to relaz totally and so mine get a bit messy!