Adeline has put up a book in it's store called "Green Day: The Art of Rock" which features artwork inspired by 21st Century Breakdown.
"A very nice addition to anyone's Green Day collection, this book features art inspired by the songs from Green Day's 21st Century Breakdown. "
If I'm not mistaken, the artwork in this book is the same which was on display in London in October of 2009.
Visit the Adeline Records store to purchase the book (only $10). I'm not sure how many they have available