I have always enjoyed doodling - just drawing patterns on scraps of paper, letting my mind wander. I have given in and tried Zentangle, which is the next stage on to just doodling. Zentangle is a way of filling in shapes with repeating patterns, but the patterns can be as simple or complex as you like and the whole process is supposed to be relaxing and meditative.
Each of the patterns has a name and there are hundreds and probably thousands to choose from. I started by following a book, but the internet has a plethora of information on there.
I do like the organic patterns, but I also enjoy building up a simple pattern into something which looks incredibly complicated. However, when the patterns are broken down into steps, they seem relatively easy to do.
It is a relaxing process and there is no right or wrong (however, me being a bit of a perfectionist, had to re-do a pattern which didn't fit well into the space I had put it and I was much happier with a second attempt). The other good thing is that you begin with a square, then split it into shapes and then fill each shape, so you are not greeted with a huge sheet of white paper, which can be a little off-putting. It is also something that can be done in a spare minute, without lots of equipment - paper, a smooth gel pen, and a ruler and pencil. Are you tempted yet?