Create an interesting pattern with the mirrors on the floor. Rearrange the mirrors until you find a pattern you like. A straight row of an odd number of mirrors can break up a brightly colored wall in a modern room, or you can use small mirrors to act as a border around the entire room. Alternatively, create a wall of mirrors by covering an entire wall with the small squares or make a pattern, such as a diamond shape with each mirror in the diamond shape hung like diamonds, too, with the points face up, down and to each side.
Measure the distance between each mirror in your arrangement. Use those measurements to mark the walls lightly with a pencil so you know where to place each mirror. Space the mirrors evenly for an arrangement that's pleasing to the eye.
Hammer a small nail or hanging hook into the wall at each pencil mark if the mirror don't have sticky backing. Alternatively, use double-sided hanging products that require no hammers, hooks or nails.
Position the mirrors to reflect something pleasant, such as a window with a nice view or a prized piece of artwork.