Paper recycling idea. Preschool, baby, or toddler sensory center. Also, try separating paper by textures and thickness for different types of bins for the kids to explore. Give older kids a microscope and other tools to explore the colors or words on the paper. Make a scavenger hunt for letters on the paper.
Sensory Tub with Shredded Paper - I Can Teach My Child!
The book, The Lorax, would be a good way to integrate english, social studies, and science concepts in an activity about recycling. The Lorax is also something fun that would get students excited about the unit.