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.
A spilled flower pot is the perfect idea of bringing a little whimsy to your garden. Just tip Southern Patio's Natural Oak Whiskey Barrel on its side, plant bushels of mums, and you have your own spilled flower planter.