I have posted a tutorial for this block.
I came up with the block because I wanted to use two particular fabrics on a quilt back, but there was not enough fabric, so I needed to incorporate a bit of a third fabric.
http://www.quiltingboard.com/t-141588-1.htm
the quilt back
[ATTACH=CONFIG]234506[/ATTACH]
Regular layout
[ATTACH=CONFIG]234507[/ATTACH]
Alternate layout
[ATTACH=CONFIG]234508[/ATTACH]