Do gorgeous fairy garden--Stepping stones with children's hands or foot prints is a nice way of allowing your kids to feel involved and leave their own mark on your garden as well as providing a small snapshot in time for you to remember and enjoy.
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
We LOVE the idea of incorporating a slide and rock ledge for the kids off the back deck. Also, the slope bed here is a nice touch, but would need more stones and moss to fit the rest of the yard. More - Fresh Gardening Ideas