Music center for preschool playground. Spray paint pots and pans and hang them along the fence. Let the students explore with different "drum sticks." They could make music with their hands, hard sticks, or soft covered sticks. Let them discover what creates different noises.
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.