It was our first Zentangle workshop today, run by Rachel, a qualified CZT practitioner. Zentangle is a way of producing a beautiful piece of artwork using a structured method, so that even if you think that you aren't arty, you still get fantastic results. It's closely related to mindfulness and adult colouring, as you have to concentrate deeply whilst doing it which instills a deep sense of calm in you.
At the beginning of the session everyone said that they thought they were not arty, and yet by the end of the session everyone had produce a unique tangle (as the finished pieces of art are called). You could go on to colour them in, but I think they're very striking when left as black and white.