Pillows play an important role in being one of the finishing touches aesthetically as well as functionally when designing a room. Basically they are useful and attractive. On a throw pillow, the decorative outside fabric is the pillow case which can be sewn shut (non-removable) or made as a zipped case (removable). Most pillow inserts are made with trillium fibers, down feathers or a down alternative material. Depending on how you wish to use the pillow most likely will determine the fill you prefer. If you have a feather filled insert and wish to have a cover for it, typically to have a good form and shape, a good rule of thumb is to have the casing made 2" smaller than the insert to ensure a good shape. Decorative pillow casings can be made from a variety of fabrics like linen, cotton, performance fabrics and more. An easy and cost effective way to change the decor in the room seasonally is by changing the pillows.