These pillow shams are 18" x 18" and fit best over a 20" x 20" pillow insert, if you like your pillows plump. If you like them softer, you'll want a smaller insert. They are white on the back with a zippered closure encased in fabric, so they look nice on the back as well as on the front. These can be made in several colors or with a design of your choice, just email us with an idea and we'll make it happen! We have premade or made to order. If you'd like a made to order, please email us at greenacrestts@gmail.com for a custom listing at no extra charge.