Determine pillow size. Floor pillows can be whatever size that you want them to be. You can also take the cover off of an old floor pillow and just recover it with a new one.
Buy the material. Go to your local craft store or Wal-Mart to buy the material. Some craft stores have bargain bins that contain material that has been reduced in price. Buy the amount needed.
Cut and pin material. Use a ruler to measure how much of the material to cut and then mark it. When you finish cutting, pin the two pieces of material right side together.
Sew material together. Use the sewing machine to sew all sides of the pillow. Take out the pins as you come to them. Leave an opening big enough to stick your hand in.
Stuff with pillow batting. Reach in the pillow and grab the bottom and pull it through the opening. Now the pillow is right side out. Fill it with pillow batting until you have the desired thickness. Finally, sew the opening shut.