http://adventurouschild.com/tree-cookies.php Tree Cookies for the natural preschool playground. Preschoolers can jump from cookie to cookie or pick up the Tree Cookies and move them around, making different patterns and trying out different distances. We love loose parts on the preschool playground! #playoutdoors
Use wood scraps for outdoor blocks - talk to your local sawmill, wood yard, or arborist! Guaranteed they can hook you up if you explain what you're doing. This would be a wonderful idea for schools, playgrounds, etc. No reason you couldn't get the kids involved and even paint some of the "blocks" with non-toxic paints as well.