Sorry for the dramatic head line. It's just what came to my mind looking at the bee block I made for the Around the World Quilting Bee. Jackie asked for a single red heart and I hope she likes my take on a "single red heart".
I raw edge appliqued the hearts onto the background and for good measure added a layer of batting to the back. After the applique was done I then very carefully cut the excess batting away, which results in a sort of Trapunto effect.