I found this little "pocket" size sketchbook. It's lime green and fits in my purse so I can take it anywhere. If I don't get new ideas out on paper, they float around in my head and I can't concentrate. So writing everything down sort of clears my head and I'm able to relax knowing my ideas won't be forgotten!
I have a box full of old sketchbooks that I go through from time to time. Sometimes I find something really neat that I don't even remember writing!