Mine is 7x3 with a dead chicken appliqued on it and has piping all around. Cut 2 pieces of fabric 7 1/2 by 3 1/2. Sew piping all around if you want this extra element. If you like you can applique a flower, leaves on a long stem. Sew the the two pieces leaving a short end open. Cut 2 pieces of muslin same size : 7 1/2 x 3 1/2, sew the two pieces together again leaving a short end open. Fill with either crushed walnut shells or fiberfill. Some people using leftover batting. Sew the opening close. Insert a 7 x 3 piece of carboard (this will prevent the pins from be pushed through the bottom) Insert the filled muslin cushion into the pretty cover and sew the open end closed.
I used crushed walnut shells as this gives weight, keeping the pin cushion in one place and with this size I have lots of room for the pins.