1. Sew together rust print 2x21" strip and green print 2x21" strip to make a strip set (Diagram 1). Press seam toward rust print. Cut strip set into ten 2"-wide green-and-rust segments.
2. Join two green-and-rust segments to make a Four-Patch unit (Diagram 2). Press seam in one direction. The Four-Patch unit should be 3-1/2" square including seam allowances. Repeat to make five Four-Patch units total.
3. Repeat steps 1 and 2 to make 20 Four-Patch units total.
4. Use a pencil to mark a diagonal line on wrong side of each green print 2" square. (To prevent fabric from stretching as you draw lines, place 220-grit sandpaper under each square.)
5. Align a marked green print square with one end of a tan print 2x3-1/2" rectangle (Diagram 3; note direction of drawn line). Stitch on drawn line; trim excess fabric, leaving a 1/4" seam allowance. Press open attached triangle, pressing seam toward triangle, to make Unit A. The unit should be 3-1/2x2" including seam allowances. Repeat to make 40 total of Unit A.
6. Referring to Diagram 4 and again noting direction of marked line, repeat Step 5 to make 40 total of Unit B.
7. For one block, gather the following matching pieces: one Four-Patch unit, two A units, two B units, two tan print 2" squares, and two rust print 2" squares.
8. Referring to Diagram 5, lay out units and squares in three rows. Sew together pieces in each row. Press seams toward squares and Four-Patch unit. Join rows to make a block. Press seams toward center row. The block should be 6-1/2" square including seam allowances.
9. Repeat steps 7 and 8 to make 20 blocks total.