A new way to crumple! Well new to me. I am sure serious crumplers know all about it. I have found very little instructional information so it's an assumption, but a pretty safe one i think.
It involves turning the thing inside out repeatedly and creating a fold each time. These ones are made with sewing patterns, and wax.
Previously my crumpled things had all been variations on the technique used for the piece in my last post.