Assemble B Blocks
1. Referring to Diagram 7, sew together two pink-and-green stripe large triangles and two yellow polka-dot large triangles in pairs. Press seams toward pink-and-green stripe triangles. Join pairs to make a large hourglass unit. Press seam in one direction. The unit should be 8" square including seam allowances. Repeat to make four large hourglass units total.
2. Sew green print 1-3/4x8" rectangles to opposite edges of a large hourglass unit (Diagram 8). Add green print 1-3/4x10-1/2" rectangles to remaining edges to make a bordered unit. Press all seams toward rectangles. Repeat to make 4 bordered units total.
3. Use a pencil to mark a diagonal line on wrong side of each brown polka-dot 3" square.
4. Align a marked brown polka-dot square with one corner of a bordered unit (Diagram 9; note direction of marked line). Sew on drawn line; trim excess fabric, leaving 1/4" seam allowance. Press open attached triangle, pressing seam toward brown polka dot. In the same manner, add marked brown polka-dot squares to remaining corners of bordered unit to make a B block (Diagram 9; again note direction of marked lines). Block B should be 10-1/2" square including seam allowances. Repeat to make four B blocks total.