For those of you who are experts at sewing, this is a breeze.
For those who have never sewn before, here's a perfect introduction!
I used two 4"x4" pieces of fabric, printed sides in.
Pin in place.
Stitch 1/2" seam around 3 sides.
Stitch 3/4 of the way across the 4th side, backstitch.
Then turn inside out, using a bone folder, if you have
one, to get the corners.
Stuff with batting.
Slip stitch the open corner.
If anyone happens to make one/some of these, please email photos!