My son's tiny metallic cars will be the death of me. Flower wall stickers are a fantastic pick for girls. Spider-Man wall stickers are an excellent method to provide those Spidey fan kids something to truly smile about.
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