First, the kids colored with markers on the filters. The non-washable markers had more vibrant colors after being sprayed.
Next, the kids sprayed them with water.
Then, we gathered up the middle with a short piece of curling ribbon and curled the ends for the antennae, then gathered up a second one for the bottom wings and attached it to the first with a long string to hang from the ceiling.
Some butterflies I left little, without bottom wings, just because. The kids think they are a lot of fun and love to see them hanging over our table.