It turns out that books with gray in the title are way more common than you think. Here are 20+ good books with gray in the title, including both fiction and non-fiction. It's safe to say that most of these titles aren't books about the color gray, but the core commonality between these books is that they have the word gray in the title.
Books with gray in the title include The Picture of Dorian Gray by Oscar Wilde, Gray Wolves by Meish Goldish, and Francis Calley Gray and art collecting for America by Marjorie Cohn. If you have a favorite gray book, vote it up below, or add it to the list if it's not already here. It doesn't matter if it's science fiction, fantasy, romance, or non-fiction - if the book has gray in the name, it belongs on this list.