http://blocloc.com/books/
The pattern is in The Block-Maker II. If you look under the table of contents you will see this pattern listed. The picture doesn't look like the quilt you see on pinterest, until you stare at it for a while and realize that the center part is changed to pinwheels. The quilt also appears on the "about us" page, near the bottom, as one of the quilts that the page cycles through.