here is a previous thread on the subject
http://www.quiltingboard.com/picture...t143917-2.html posted by the 'designer' Linda Rotz Miller and she gives info on the sizes of the squares she used.
and in this link
https://www.flickr.com/photos/52794248@N06/5040869895/ she states that she just made up squares
and this is her website
http://quiltsandquilttops.com/