The very first quilt I made was denim. Since I didn't know anything about quilting, I just cut 6/12" blocks of different denims and regular blue fabric, then alternated them. I had all sorts of jeans: stone washed, dark blue, light blue, bleached look, and just plain old used look. My son still has it after 11 or 12 years and loves it. Thinking back, it was fun to make.
Be sure to post what you do!