I started making these pins when my daughter was in preschool, and they've evolved over the years. The first ones were very grandmotherly heart shapes with lace all around the edges. Now, I cut out squares with my pinking shears and layer on top of that.
When I first cut the two squares out, they look like little felt raviolis. I do ribbon embroidery on the hearts, and then I add seed beads and my own made-up embroidery stitches around the outside.