"outdooor" housing?

I got the thought when a friend built a spider cage but I dont plan on doing it, just something Ive been wondering over the last few months.

What would be a good natural cage setup for a hedgehog? Some grass, sticks, a few stones, an area of dirt they can dig into for a hole? How "efficient" would it be at breaking down hedgehog waste?

Its just a thought thats been in my mind.