Every once in a while my husband gives us his almost empty flip chart paper pads. They have 2 or 3 pages left and aren’t worth lugging to meetings. They become great fun for the kids to play with. They draw on them, fold them, and use the cardboard backing of projects. My son made a giant fortune teller! 
We also recently discovered another paper project. It is an accordion organizer made from folded paper. This pad of colorful square paper came in very handy.
