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.
Ladybug for dessert landscaping
Whimsical Garden Mushrooms from old bowls and tree branches
I've got a bunch of bamboo stakes I picked up at a Master Gardener sale. Need to find small bottles (Bottle Painting)