My next novel, Little Brother, is my first kids' book, a young adult novel about hacker kids in San Francisco who fight the anti-terrorist cops to reinstate the bill of rights ("A rousing tale of techno-geek rebellion, as necessary and dangerous as file sharing, free speech, and bottled water on a plane." – Scott Westerfeld, author of UGLIES and EXTRAS). Tor Books's brilliant Art Director Irene Gallo worked with designer Peter Lutjen to create the cover for the book — the best one I've had to date. She's got a post up on her book design blog that goes into some detail on the creative process.
Peter Lutjen came up with a bunch of different designs that eventually evolved into the final. The penultimate version used a photo-realistic illustration that everyone almost loved. One last tweak of the design was to have the imagery re-drawn in a freer more organic style by Yuko Shimizu — that seemed to unify everything to everyone's liking.