Somehow or other, life always comes back to the kitchen.
Could you use them as kindling? It seems like you could probably also grow a plant in them or use them to divide up your garden come spring (remove the bottom, flip it upside down and pound into ground, fill with soil - tiny raised garden)
Love it! I remember when she brought the fairy house made out of an oatmeal container (I think), covered in pieces of bark to preschool. It even had a little door -- I really loved that! This is even more intricate and detailed!
There is a cute idea in this month's Family Fun magazine: make the box into a doll house. And they recommend hollowing out a couple of clementines in a particular way and using them for votive holders!