Envelopes in another design and the start of a yahoo group

Lately I looked in the in the Internet for some nice ideas for art. On that way I also bought myself a new book for ATCs which hopefully will arrive in the next few days. And while I ordered this book I found out about another kind of art which made me really interested. It is Zentangle®. I already tried it for some envelopes that I made. :) Does anybody of you already knew about it and make those little pictures?

And I created my first own ATC group with Saskia, a pal of me. If you are interested in ATCs and would like to join us there, you are more than welcome. We are still at the beginning and could need new members. Here is the Link to it: Magical ATCs