We made butterflies using baggies and a pipe cleaner. Tried the zip type baggies first, but they were just too stiff and didn't give a good shape. Went old-school and used the fold-top bags and they worked MUCH better.

I let B decided on the collage materials to use and she chose some colored and gold grass and torn up tissue papers. I have seen these with paint smooshed in the baggie, but you'd have to use the zip type and seal with glue TIGHT for that. I like how the collage materials gave them some heft and a more 3-dimensional shape. She was thrilled. I asked if she wanted to make a caterpillar clothes pin for it, but she didn't want to. I made this one as an example. It would go great with a caterpillar-to-butterfly demonstration with a chryslis made from a TP tube with an end folded and stapled together and some brown and green markers used on it. If you're really good, you could leave the TP ends open, have the baggie "wings" inside it, run the caterpillar in one and hook onto the wings and have it emerge as a butterfly on the other side. I have to practice.