Zentangle Mail Art

Relaxing Doodles that can take hours :)
I started doing Zentangles to help advance my drawing, but doing them seems to calm me. So now i pretty much do them anywhere; at work, on the train or in coffee shops as im sipping my Caramel Latte.

Zentangles can either take minutes or hours depending on the size of drawing surface. I wanted to do Zentangles on envelopes as i have a few penpals that i write to and i find i have nothing spectacular to send my letters in (not big on stationary). So i came up with this in nearly 2hrs.