Rugs that fall on the grayscale, ranging from black to nearly-white, are true classics. If you're looking for a rug that will add depth to your decor without overpowering it, then a rug in this color scheme might be the right one for you. Black and gray rugs come in a variety of different styles and textures, ranging from thick shags to thinner and more durable washables. They also come in plenty of different sizes, from runners all the way to room-filling.