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.
Interesting and stunning Penny wall! Penny's applied to MDF while lying flat. Then covered with bar top epoxy for the gorgeous "underwater" effect. One wall in dinning room to accent rhetorically penny backlash in kitchen