I first posted this on my sister blog and then again here in April 2104. I am reposting again today to make it easier for my students to find this blog post.
You will need the following to make one block:
A) One 5 x 5 inch blue plain/tone on tone.
B) One 5 x 5 inch red plain/tone on tone.
C) Two 5 x 5 inch white on white.Sew together as above to form a four patch block. Press the seams open.