I also made the seat cushions. The fabric is from Henry Glass designed by Barbara Jones. It's her Bubblegum Basics line and it is very cute! I actually ordered it from her. She lives in Bountiful, Utah.
To make an easy seat cushions:
Trace the seat of your chair onto a piece of paper. Calculate seam allowance and thickness of your foam pad. I used a 1 inch pad and a 1/2 inch seam allowance so I drew my pattern 1 inch wider all around the original seat shape. Also, make where you want the ribbon to come out to tie onto the chair back. Cut out the pattern. Lay out and pin onto your fabric (which should be folded wrong sides together). Mark fabric where ties should be. Cut out. Baste ties/ribbon onto marking. Pin right sides together making sure the ribbon is on the inside. Begin sewing on a normal stitch. Leave an opening at the back to put foam. Clip curves for a better shape. Turn right side out. Push out curves and corners as best as you can. Cut out a piece of foam with the original sized seat cover pattern. Put foam inside seat cover. Slip stich opening closed.
I still need to finish that tablecloth and then we're done!