Came across this very cool app that tracks your mouse and draws out lines on a large canvas. The app is called MousePath and was created by Anatoliy Zenkov.
You run the app and leave it in its maximized state and then go about doing your daily work. And when you are happy with the art created just hit the S button and it will create a file in the same folder where the app is running.
Here is my mousepath art created after 30 minutes: