Diane Culhane's online class, "Doings of A Doodle" is just finishing up. The class has been a fascinating exploration of the doodles that begin (somewhere) in the brain and move to the hand and then to paper.
Doodling from left to right:
At the edge of the page I just kept going :-)
A really interesting exercise that I had never done before was to doodle while reading (no peeking at the paper - a "blind doodle"):