I found Zentanlges about a year ago and became completely enthralled with them. The Zentangle site is an amazing wealth of knowledge, the newsletters contain many different "tangles". Maria & Rick make it very easy to understand how to create the different patterns.
When I first looked at the site I thought "there is NO WAY that I will ever be able to make those..." It took me a while to actually try to draw something, I kept looking for more information and found a few websites that have images and some where the authors have created patterns of their own that they share on their sites. There are some amazing artists out there!
I finally took the plunge and this is what I came up with. this is an ATC that I created on 80# White Cardstock with a black Micron 005 pen. It didn't take me long, and was very relaxing; and now I'm hooked.