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.
Willow garden cloches protect plants from animals, and provide support to plants that need a little protection from the wind or a place to climb. Don't have willow but will try with some of my branches.
dark walls dark sofa, consider your furniture colors when selecting a wall color. This sofa blends into the walls even though it's a bluer/cooler gray than the walls. More contrast in the colors would set off the sofa.