Herbs in coffee cans, hung with zip ties. Drill a hole in coffee cans & zip tie to railings! You could pretty much mount any container, like a box in this same way. bigger containers may require more zip ties.
Old Doors in the Garden. salvaged door in the garden. I've seen them used beautifully as garden gates or as trellises for vines. Either way, I think they're completely charming and perfect for a shabby chic or English country garden.