I really enjoyed The Giver. It's a book for children that deals with serious themes of futuristic utopia, population management, and euthanasia. The Giver is the individual assigned to be permitted to understand pain and suffering, but also great excitement and pleasure. The Giver is in a way responsible to keep the lessons of the past alive, bearing the burden of knowledge so that society may exist in its supposed perfection where no one experiences negativity or even sees color. The color thing is obviously playing on the blandness of this utopia.
Going on what others have said, I also really enjoyed Ender's Game/Speaker and read that entire series. He also wrote a very interesting series called the Homecoming saga which I would definitely recommend.
_________________
We seldom realize, for example, that our most private thoughts and emotions are not actually our own. For we think in terms of languages and images which we did not invent, but which were given to us by our society - Alan Watts