These are metallic painted and heat treated Tyvek "jewels". That's how I always think of these, because of the shiny metallic paint that I used, they really glow and have a nice shine. In a different way than the dichroic glass above of course, but still shiny. I think they have a lot of presence because of their unusual and organic shapes, you're not sure what exactly they are, so they require more up close investigation.
The way that the Tyvek folds in on itself and bubbles up is so unpredictable which is a big part of the fun of making these. They are easy to use as an embellishment on a quilt, you can pierce them pretty easily with a needle and they are super lightweight and easy to bead upon.