Step 1: cut out 4.5 inch squares. Fold the part you want in the middle in half. Crosscut the fabric you want as background, for four triangles. I think the center white fabric was cut at 2.5".
Step 2: Sandwich folded square in the triangles, right sides facing, as shown.
Step 3: Sew with scant 1/4 inch seam along either side.
Step 4: Open out and press the triangle "wings" out from the folded center fabric.
Step 5: Good luck with this step. Pin the edges of the triangles together, sandwiching and getting that center folded piece centered such that it will be caught in the stitching, as well.
Step 6: Stitch the pinned edges together, pulling pins and adjusting fabric as you go.
Step 7: When seam is finished and the pins all pulled, you should have a puffy center. Flatten the background and center to make a square. The edges of the center will be about a quarter inch beyond the seams. Press and flat, then toward center. This is when you could check my measurement for the center white piece, because you'll need a piece to lay in the square up against the seam.
Step 8: Lay the smaller square piece in center and then fold the center square's flaps over its edges, forming a curve. Stitch the flaps down, trapping the smaller square under the flaps.
