I'm usually not that big on the whole 'natural play spaces' thing because most of them look too much like workout equipment and don't have much room for imaginative play- but this one actually looks great!
Wood pallet sandbox, with bench seats that unfold to cover the sandbox! I hate sandboxes bc it's like an outdoor litter box for wild critters. Love that the cover will keep them out! Hubby is going to hate that I found another pallet project :D
How Would You Like A Galaxy driveway? It is possible by using "glowstones" in your concrete mix, but it is not cheap. The upside of the extra expense I guess is that you wouldn't need any outdoor lighting as the stones hold light for around 12 hours.