An oversized area rug is essential in living room decor because it visually unifies the seating area and adds warmth and texture to the floor, creating a balanced and inviting atmosphere. For example, a nine by twelve foot rug anchors furniture to define the floor plan clearly. This grounds the space and softens hard surfaces, making the room feel cozy yet expansive. An oversized rug also adds scale, preventing the room from feeling flat or empty, especially in neutral color schemes. Consider choosing one with subtle patterns or warm hues that complement your base colors to enhance personality without overwhelming tranquility.