I love the colors you chose.
I think this technique is new to me.
I don't remember seeing or hearing about it before.
Here's a brief description:
http://books.google.com/books/about/...d=dxULqG9BQu0C
(if you view the book, you can a more detailed explanation)
ANd the book at Amazon:
http://www.amazon.com/Teach-Yourself.../dp/1601407564
Here's another picture:
http://siterepository.s3.amazonaws.c..._fold_crop.jpg
And here's a little tutorial - but I'm still buying the book:
http://irene-sweetseasonsoflife.blog...-quilting.html