Make a wind chime out of old keys and acrylic paint. - This site has lots of cheap outdoor/backyard ideas. I can't use most because I live in an apartment - but I love the old key to windchime and spray painted folding chairs.
What an beautiful picture. This photo is so pretty. There is just one failure in this whole picture. The one failure is that leaves are not transparent so you would not be able to see through the leaf.