Perhaps because there are so many variations of the color blue, it is one of the more popular colors for a floor covering. A blue rug can be appropriate for almost every room in the house. Bedrooms can feature a blue striped rug to set off the furnishings the rest of the room. Blue is considered a cool color, so the use of blue makes the room look larger. In a warm climate, blue may be selected to make the room seem cooler.