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.
Faerie Garden in a lantern! I have one, though I'd love to get my hands on a little faerie figure like this one! I have a battery operated tealight in my lantern, but I like the plant idea. Maybe succulents.