Making your own pillow is fairly easy. All you need to do is decide how small or big you want your pillow to be. I like to use muslin cloth as my cover (just 2 pieces of the size dimensions of your choice), and a poly fill stuffing.
Sew all sides leaving enough of an opening to fill the pillow. If possible serger the edges or zigzag so the material doesn’t fray when you need to wash it. Then sew the opening closed.