This is the front of the pillow, with a 1" banding on the ruffle and a contrast welting to bring the green of the fabric out.
The back is the same fabric as the front, but the "banding" on the front is the entire ruffle on the back. There are also buttons from the same black and white fabric. Turning the pillow over gives a different look to the bed.
This pillow has a 3" ruffle and 1/4" green checked welting with the dark, larger scale floral print on the front.
The back side doesn't even look like the same pillow. By using a different fabric, even with the ruffle being the same fabric, it completely changes the look of the pillow. They are harder to see, but there are also covered buttons from the green checked fabric.
A lot of times people do not want to have tons of pillows on their bed. By using different fabrics on the front and back, it is possible to have twice as many pillows! The only drawback is you cannot have both sides showing at the same time. Minor detail, though.