OP - love your quilt. That pattern is just so neat.
Here's how I did mine for those asking if it's hard to do. This is a strip piecing method. Granted I took a class for it so I had someone there to help me but if I can do it anyone can do it!
http://www.youtube.com/watch?v=DWpSETMbws4
If that link doesn't work you can search Not Your Grandmother's Tumbling Block.