This project has introduced me to two materials I’ve come to like – color catchers and that mylar stuff. The color catchers (once dyed with laundry bleeding) cut well, are easy to sew, can be glued, and also can be drawn on with colored pencils. The mylar stuff also cuts well and is easy to sew. For a bonus it crinkles up in a most interesting way when ironed.
I discovered the crinkling by accident and then covered the strips with parchment paper and ironed them with an iron at a synthetic setting to deliberately crinkle them.