That's a wonderful quilt! What was it about it that makes you say "never again?" Was it the weight? I've thought about doing one of these but I haven't decided yet.
Below is a link to a good thread a few months ago about denim quilts. Several people posted pictures throughout the thread that might give you some ideas if you don't want to do the circles again. See page 3 for some interesting versions of denim quilts from Quiltedsunshine. You can PM her for info on her patterns and templates.
http://www.quiltingboard.com/main-f1...t-t248826.html