This is what I've done in the evenings since giving up the video game - Bejeweled. I did it with a Bic medium point pen on a piece of my sketchbook paper. I worked an hour at a time here and there. I had a lot of fun with it and would like to move on to another. Next time - a little nicer quality paper and a different pen. I'm sticking with black and white for a while but I have seen some absolutely gorgeous zentangles in color.