Find used mirrors for cheap, and add your own touches. Take drift wood, broken plates, colored glass or other materials and create a unique frame. Hang in a shaded spot in your garden.
Do you have metal indoor wall art you are ready to take down? Give it a new life in your garden. Paint or refinish to change it up a bit.
Baskets on walls can be a nice decorative touch. Select some old time favorites from inside, and move them outdoors.
Small items in a collection look great as garden wall art. Here are few: crosses, skeleton keys, letters, plates, mirrors or medallions.
Have fun, and add your favorite things to your garden. You will be glad you did.