Select a skein of 1-inch thick grosgrain ribbon in a color that complements your cushion covers.
Cut two pieces of 24-inch long ribbon per cushion. Apply a compound to the cut ends to stop them from fraying.
Remove the cushion from the chair.
Use the seam ripper to open the back right corner seam 1 inch in the center of the seam.
Fold the ribbon in half and insert the fold 1/2-inch into the open seam.
Sew the seam back together through the ribbon with needle and thread. Repeat for the left side of the cushion. Because the ribbon is sewn in the middle of the seam, you can turn the cushion over if one side becomes soiled.