Brenda -
You make a total of 24 blocks that are 12.5 x 12.5. From each of your 2 fabrics (A and B) cut the following:
12 squares @ 8.5 x 8.5
24 strips @ 8.5 x 2.5
24 strips @ 12.5 x 2.5
Frame the Fabric A squares with Fabric B strips, and the Fabric B squares with Fabric A strips. Sew your blocks into rows, alternating A blocks and B blocks. This one doesn't really need a border since the blocks are bordered, but you can put one if you want to.
Darren