I pulled out Fearless Design for Every Quilter by Lorraine Torrence and spent some time reviewing the ten chapters or exercises that focus on Design Principles and Elements and then Design Sources and Inspiration. Lorraine worked with a critique group that met and worked through the exercises, showing their work and adding comments on their thoughts and processes along the way.
I think this book would be an excellent addition for a critique group to use, in fact, Lorraine gives tips on setting up your own group. A good book to add to your summer reading!
Visit Lorraines website at: http://www.lorrainetorrence.com/ to see more of her books and patterns.