Outdoor tic tac toe using stone tiles and rocks. I would make a small garden for the kids and have this in it. Cute decor when the kids aren't playing with it. Great for when the mom is at work and the kids want to play
Instant outdoor sink—no (extra) plumbing required! This convenient outdoor sink makes it easy to rinse vegetables, repot plants, clean garden tools and clean up after a day in the yard. Even includes a hose with an easy-wind reel!
Dog Pond - Place a plastic kiddie pool in the ground. It'd be easy to clean and looks nicer than having it above ground. Big dogs can't chew it up or drag it around. This is obviously more fancy than a plastic kiddie pool underground, good idea thou