We got a new gray couch about a year ago. It came with four throw pillows, but it really needed four more.  I had four pillows on my old couch that didn’t match the new couch, but I’ve used those pillows anyway.  I finally decided to get some new pillow cases.  I love the textures on these and they go with the pillows that came with the couch.

Four 18 x 18 pillows: https://amzn.to/2O2nHbr
Blue Pillow Covers: https://amzn.to/32W5Wi8
White Pillow Covers: https://amzn.to/33ZIW31