1. Use a pencil to mark a diagonal line on wrong side of each yellow tone-on-tone 3-7/8" square.
2. Layer a marked yellow tone-on-tone square atop a pink print 3-7/8" square. Sew pair together with two seams, stitching 1/4" on each side of drawn line (Diagram 1).
3. Cut a pair apart on drawn line to make two triangle units (Diagram 1). Open triangle units and press seams toward pink print to make two triangle-squares. Each triangle-square should be 3-1/2" square including seam allowances.
4. Repeat steps 2 and 3 with remaining matching pairs to make 72 triangle-squares total (4 sets of 8 matching triangle-squares for blocks and 20 sets of two matching triangle-squares for outer border).