I'm off for the day - my first born turns fourteen and I'm thinking this calls for pancakes followed by a bit of shopping. Maybe for books since he goes through them at a prodigious rate. (Suggestions welcome - current faves include Derek Landy, Philip Ardagh, and Joseph Delaney).
In the meantime, might I suggest you head over to the Bookwitch site and check out her terrific profile of Oliver Jeffers. May inspire you to do a bit of shopping of your own.