Rolls of roses: Simply plunge the cuttings into the ground. Before planting cuttings, push the bottom end into a small potato, which keeps the cuttings moist as they develop roots. It sounds crazy, but the row of allotment roses is proof it works.
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.