A stone castle almost as sturdy as its full-size counterpart for your yard or garden. Creative crafts lovers might be able to build their own castles; otherwise, check fairy garden specialty websites for intricate accessories such as this.
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.