I made one of these for my garden - just don't forget to drill holes in the bottom for drainage
An old wheatered canoe as planter. Antiques shop idea. Habacuc 2.2.
Outdoor piano garden. That's very cool. You'd need a lot of space, but Craigslist always have free pianos in their "free" section. Obviously doesn't need to be in nice condition. They also took the top off the piano bence and turned that into a planter.
The Greenbo Planter is a revolutionary product which provides a unique solution for growing plants/flowers in an urban environment.$27.95
Old window or shutter for vertical garden http://inspirationgreen.com/shutter-reuse.html
Upcycled Planter and Container Inspiration — Roundup
Not the most amazing example of this, but who hasn't seen dressers on the curb destined for less?
Chalice Well Gardens: Entrance Greenman. Chalice Well Gardens, Somerset Chalice Well is one of Britain’s most ancient wells, nestling in the Vale of Avalon between the famous Glastonbury Tor and Chalice Hill (by Phoenix SpringWater)