Leave plastic animals in a bin outside (near the garden, next to the sandbox, next to a patch of trees, etc) -- when children go outside to play, they them and let their imagination.forward to playing outside
Interesting idea for putting a play area on asphalt, concrete or hard soil in a temporary build. The tires and rocks can be removed, and the sand and rocks swept up. Interesting idea for day cares in urban settings without access to grass or soil.
Famous Monuments - 13 Buildings Children Should Know with Free Printable - great pictures / fantastic idea. maybe use regular legos for older kids and modge podge the pictures onto the blocks. have a "building set and an example card.