Denim String Quilt made using 10" Paper Piecing Squares from MSQC. White denim was cut 1 1/2" wide. Various blue denims were cut various widths from 1 3/4" to 2 1/2". MSQC has a youtube video on how to make a string quilt.
There was another quilt I saw at the Northwest Quilting Expo yesterday that I'm still thinking about. It's this one, Family Genes, made by Jeanne Halapoff from discarded denim, mostly her in-laws'. The ultimate in reusing.