The Peabody Essex Museum in Salem Massachusetts has some great children's activities, often crafts using recycled materials.
The kids were dropping small objects insdie the ooblik (made of cornstarch and water) to see which would sink the fastest.
I was particularly impressed with the styrofoam pieces that come in different colors. They are made with cornstarch instead of plastic and sold in craft's stores but I hear that there is a push to have all packing peanuts made from cornstarch instead of plastic.
Check out this site http://www.magicnuudles.com/
On the way home my husband discovered that the trash bin at the famous House of Seven Gables Museum held straw bales from Holloween decorations. He needed them for his strawberry patch and here are a few pics of my recycling husband....
Last but not least I want to share the awesome world renowned John and Rebecca Higby Yoyo show:http://yoyoshow.com/