Here I have chosen 2 Nine Patch blocks to match THIS quilt.
If you are going to quilt a top you will need to layer it,
top, batting and backing,
(note that the batting and backing are slightly larger than the top)
then stitch as desired.
Cut fabric for the back of the slipcover, 2 for each pillow.
Cut it to the same width, but the length needs to be about
2/3 of the length of your top,
you'll be sewing a complete square.