Storage for pool. Easy to build, I think the bottom would have more holes for water draining. Maybe staple some sort of screen inside the bottom also to keep small critters out and probably some casters or short legs to keep it off the ground.
green bean teepees. This is amazing! What a great idea for some serious green bean growing. This would also work for strawberries, peas, grapes and possibly squash varieties. Basically, anything that can grow vertically!