Read this book. Really. It will make you feel creative. Jonah Lehrer explains how we are all creative, and does so in a, well, creative way. Even his website is awesome, check it out http://www.jonahlehrer.com/
He scientifically, yet accessibly, explains some of the most memorable creative moments in our history from advertising slogans to Bob Dylan songs to inventions. Everybody is talking about this book. Listen to the times.