Morning glory porch screen -- You can't eat morning glories but you can use this idea to grow green bean plants that run, such as pole beans or half runners. It will make it easier to pick them plus provide some shade and privacy on your porch.
Keep the garden vertical. That's why it's good to look for shrubs and trees that max out interest as they grow up, not out. Try dwarf varieties for a small backyard, as well as more columnar evergreens (bonus—they boost wintertime interest, too).