The Last Sunset On Earth — Susan Hart

The Last Sunset On Earth, tells the story of a future world--one that's all gray. Gray buildings, gray thoughts, gray people. It rains all the time and the government has forbidden color because they think it gets people too excited. Some cut themselves just so they can see red blood. It's forbidden to grow flowers because they serve no purpose, but one woman and then one man, together, grow a perfect sunflower and find each other in a most intimate way