Place a large area rug in the center of the room. Area rugs absorb sound when placed in a sparse room, and can pull the room together when the rug's colors complement other items in the living space.
Set a bookcase in the room, and fill it with books. The books and bookcase reduce echoes in the room by way of the books' paper.
Add upholstered furniture to the space. Fabric absorbs sound, and on furniture, it minimizes the available space sound uses to travel around the room.
Open the room's windows. Trapped sound stays confined within a space and increases the volume of the space's echo. Or hang curtains over your windows to soften the sounds of the room.
Hang uncovered pictures on the wall. Framed pictures with a glass covering increase the sound's bouncing effect, whereas uncovered pictures dampen the space's sound.
Balance the space of your room. In addition to too little furniture, an unbalanced room also results in echoes when one part of a room lacks furniture or decor. Even out the room by placing a large plant in the corner, or add an end table with a table lamp in the corner.