DS 8 liked the zillion Warriors books and is now reading Hunger Games (it has a sequel Catching Fire--I read the first and it was great). I also really enjoyed the Margaret Haddix (Among the Hidden, Among the Imposters, etc.) series. DS 11 read Sabriel, Lirael, and Abhorsen last year and enjoyed those.

My oldest DS is my real book worm. At a garage sale he picked up a biography about the guy who started McDonalds. I thought it was strange but he read it immediately and then started reading biographies of other innovators/magnets. Maybe some non-fiction will help inspire him, if you (or he) can find something that interests him.