1. Gather a set of white print pieces (four 2-7⁄8" squares and four 2-1⁄2" squares from the same white print) and a set of blue print pieces (four 2-7⁄8" squares and four 2-1⁄2" squares from the same blue print).
2. With a pencil, draw a diagonal line on wrong side of white print 2-7⁄8" squares. (To prevent fabric from stretching as you draw the lines, place 220-grit sandpaper under the squares.)
3. Layer a marked white print 2-7⁄8" square atop each blue print 2-7⁄8" square. Sew each pair together with two seams, stitching 1⁄4" on each side of drawn line (Diagram 1).
4. Cut a pair apart on the drawn line to make two triangle units. Press each triangle unit open, pressing seam toward blue triangle, to make a triangle-square (Diagram 2). The triangle-squares should each be 2-1⁄2" square including seam allowances. Repeat to make eight matching triangle-squares total.
5. Referring to Diagram 3 for placement, sew together two triangle-squares, a blue print 2-1⁄2" square, and a white print 21⁄2" square in pairs. Press seams toward squares. Join pairs to make a unit A. Press seam open. Unit A should be 4-1⁄2" square including seam allowances. Repeat to make a second unit A.
6. Referring to Diagram 4, repeat Step 5 using the same pieces in a different arrangement to make two of Unit B.
7. Referring to Diagram 5, sew together A and B units in pairs; press seams toward unit B. Join pairs to make a star block. Press seam open. The star block should be 8-1⁄2" square including seam allowances.
8. Repeat steps 1 through 7 to make 42 star blocks total.
9. Repeat steps 2 through 4 using the remaining assorted white print and blue print 2-7⁄8" squares to make 112 triangle-squares total. Set aside for outer border.