Elf house on a tree! That would be cute in the garden, especially in the tree over grown with ivy. How about some battery tea lights in the windows during outdoor parties. I hear the fairies/elves whispering "home school project" in my ear.
Clever idea from my husband: Steps to tree stump fairy garden made from tree limb coins/wedges, with a nail hammered into side, nail head cut off, then hammered into side of tree stump. - Gardening And Living - Fairy Gardens
10 Step by Step ‘Recipes’ for fairy gardens you can create around any tree in your garden, plus, a look into the deep foresty world of fairy house maker, Sally Smith and a fascinating video of how she works!