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.
Want to grow square Watermelon. Yep you read it right. If you do, find a waterproof box and use it to put a small watermelon in with the lid open so the vines can grow out, takes all season but keeps pests away and makes a great square watermelon!