I've always thought that a handy formula for creative success (on any given project) is to give yourself specific constraints to work through. Having limits to work around often kickstarts your creative momentum, and the results can be fantastic. Indian artist Vishnu M Nair bought a small red sketchbook and decided to fill all the pages in one sitting. By the time he reached the back cover of his brand new sketchbook, Vishnu had created 29 illustrations in about 2 hours. NICE.
Maybe some of you doodlers out there should take this challenge on next time you feel the intimidating stare of the blank page.