This makes an 18" block!

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Then cut the Color 1  3-7/8" x 31" strip into eight 3-7/8" squares. Stack these and cut once on the diagonal to make sixteen Half Square Triangles...

Next, cut the Color 2  3-7/8" x 7-3/4" strip into two 3-7/8" squares. Stack these and cut once on the diagonal to make four Half Square Triangles...

Now cut the Color 3  3-1/2" x 42" strip into twelve 3-1/2" squares...

Cut the Color 3  3-7/8" x 23-1/4" strip into six 3-7/8" squares. Stack these and cut once on the diagonal to make twelve Half Square Triangles...

Pair up the twelve Color 3 and twelve of the Color 1  Half Square Triangles right sides together and edges aligned. Using a 1/4" seam allowance, now and throughout the block-making, sew together twelve Half Squares. Press seams of each to the darker side. These should measure 3-1/2". Repeat this process with the last four Color 1 Half Square Triangles paired with the four Color 2 Half Square Triangles to make four more in that color arrangement...on to Page 2!