I found it pretty easy to get one of those big plastic drums, tub trugs, or water barrels, build a simple melamine box bigger than the vessel, wipe the vessel in old motor oil, and cast concrete around it, filling the tub with rocks as you go. You can make these super big for super cheap if you like, just cast them in place as they are heavy (and sturdy). I found the look right for us for a clean line modern look, and pretty dam theft resistant for a front yard or driveway or walk, and able to plant dwarf citrus in pretty easily. Put a piece of pvc in the bottom for water to drain out. Not everyone's taste but they look a lot more intentional than a plastic barrel alone imo.
