For pillows standard sizes I use and mix match on our sofas are 18 x 18, 20 x 20 and sometimes 22 x 22 plus a small lumbar. Always size up your inserts! Living rooms, cozy living room, living room rugs, wool rugs, checkered rug, neutral rugs, coffee tables, home decor, coffee table styling, coffee table ideas, pillows, pottery barn look for less LTKHome