At the Bottom of Everything by Ben Dolnick [A stunning novel of friendship, guilt, and madness: two friends, torn apart by a terrible secret, and the dark adventure that neither of them could have ever conceived.
The Seed Collectors by Scarlett Thomas. Great Aunt Oleander is dead. To each of her nearest and dearest she has left a seed pod. The seed pods might be deadly, but then again they might also contain the secret of enlightenment.
This book cover shows excellent figure ground/negative space. The contours formed by the position of the fox serve as the shape of a boy, I'm assuming "Peter." This empty space also creates a wonderful focal point for the book title to nestle into.