Here at Ghostbot, we've gotten into the habit of drawing our storyboards on tiny 1 and 3/8 inch by 1 and 7/8 inch post-its. We found that it is an easy way of getting longer format work done. The pencil mileage on a tiny post-it is a lot less than a giant 12 field sheet of paper. Also it forces us to keep our compositions simple and clear. During down time (or brain farts), I found myself sketching these ugly mugs on those tiny post-its.