There are a lot of ideas for this out there. I found this one. I thought the rag quilt was cute and there are instructions and different ideas. Have fun! https://thewhoot.com/whoot-news/crafty-corner/diy-denim-rag-quilt-instructions
It’s a super easy project! Here’s what we did: https://www.frugalfamilytimes.com/2018/07/how-to-reuse-old-jeans-to-make-denim-quilt.html?m=1
Cut it into strips, squares etc. any size will do so long as you will have enough for a seam allowance. Have fun sewing.
There's some gorgeous examples here on Hometalk, Alinda
You can cut into squares or strips to use as pieces for a quilt.