I made this quilt a few years ago in a class with Kaffe Fassett. The pattern is called Square Clamshell. The instructions are in his book, Museum Quilts. He directed us to cut a lot of squares and put them up on the design wall as quickly as we could. This helped us use our intuition, rather than thinking too much.
The Rebels helped me figure out what to do for sashing and borders. I was amazed at how many colors it takes to make a red quilt!