If you don’t have a triangle die-cut blade, don’t despair! There are some great 60 degree rulers on the market.
To make an envelope pillow, cut two back pieces 10″ x 15″. (If your front is different size than mine, cut your back pieces the length of your block and the width being 2/3 of your front measurement.)
Fold in one long side of each backing piece about 3/4″ twice and stitch in place.
Place backing pieces wrong sides together with the quilt block.
But I also played with this block out of Pat Bravo’s new Rapture collection. It’s always fun to see the look an entirely different palette of fabrics gives to a block.