http://www.quiltingboard.com/t-141588-1.htm
Here is my tute on variant D9P. (I invented this variation.)
They ended up looking like windows. Just change the proportions of the original blocks to get something more square.
You would put your landscape squares in the 4 corner blocks.
If the layout in the window is
AB
CD
sew them together in this order
DC
BA