Messing about with pen and ink and just playing with what ever will come out onto the paper. I find that (and I am sure I have said this before) doodling is a great way to take your mind of things, or even work through them when the need takes.
This one started out as a few lines
I then started adding some shapes and patterns elsewhere on the page
I haven't quite completed it, but decided that I would dip in and out when I felt like it and see where it takes me. It is sometimes nice coming to a page that already has something on that you can if you wish do something
What are you doodling at the moment, do you like starting with a fresh page or will you add to a piece in progress?