Sue has gotten us a lot of wonderful, new, indoor gym equipment, but at this time of the year, I can't help but "Think Spring". Wouldn't it be fun to build something like this to put in the grass at the far side of the playground?!
Make an outdoor music wall. Perfect solution for children who want to BANG and experiment with sound, in an area that is less aurally-offensive to others in the class. www.prekandksharing.blogspot.com
Homemade water wall. Great way for children to play with water in the garden.
Fall leaf lion from paper plate craft for kids
Hm... climbing frames and planks. Not terribly "natural", but it's something the kids would get a lot of use out of. And could be extra seating when they run outside with a snack...
Another great craft that uses recycled plastic water bottles. This project makes bubbling blowing easier for little hands.