Blue rugs are bestsellers because they are so versatile: they represent the ocean in nautical and coastal themes, bring calm to children's rooms, inject cool hues to tribal designs, and soften a modern rug. This color is preferred for libraries and offices because it promotes peace and concentration, but can be used anywhere. Bathrooms, living rooms, and outdoor entertaining spaces also often feature the color. Complimentary shades to blue are greens and purples. It contrasts well with warm colors like yellow, red, and orange.