Here is a little pincushion I made, my first attempt at Cathedral Window quilting. It is a time consuming process, but worth the effort for smaller projects. I have aspirations to make a white silk pillow with purple, blue & white hand dyed, almost a tie dye style, fabric "windows".
I used the book Cathedral Window Quilts: The Classic Folded Technique and a Wealth of Variations. It's well written and easy to follow. The difficulty comes from the complexity of the process, but the author has done a great job simplifying it and including step-by-step illustrations. The author is a true artist and has explored, and I believe, invented a number of variations on this technique, so there are several other great quilt patterns included. The book is available on Amazon: http://www.amazon.com/Cathedral-Window-Quilts-Technique-Variations/dp/0715327135/ref=pd_sim_b_1