A web search found a solution. Origami money. Oh, yeah, but you need talent for that. And the ability to follow complicated directions. That's a smallish problem. We tried quite a few samples we found online - hearts, chains, boxes. Sigh. But this one turned out quite well and was surprisingly easy.
Fold the sides toward the center.
Fold the bill in half to make a crease.
Fold the corners to meet the center crease.
Fold the top to the center crease.
Fold the bottom to the center crease.
Fold it in half along the center crease.
Put three or four together.
Fasten at the center.
Gently open the petals.
And the final product.