Tree planters - I would add wheels so you can take them with you when you move. Otherwise, a fork lift might be required.
Build a planter box. More
Centsational Girl » Blog Archive DIY Criss Cross Outdoor Planters - Centsational Girl
*3 metre PLANTER WITH TRELLIS* IN BLACK | Trade Me
Espalier in wooden cubes - Fantastic idea. Could be done even easier with Star Jasmine or Potato Vine.
“How to Build a Planter Box” — The Official Site of Chef Georgia Pellegrini | Food, Travel, Lifestyle, Hunting and Redefining Slow Food
Planter Box | Como Lake Carpentry
Portable Nosey neighbor blocker.LOL! (Privacy Screen | Flickr - Photo Sharing!)
Hydrangea paniculata 'Limelight', large white blooms tinged with pale green; trailing Ivy at the base spills over the sides of the classy zinc planter boxes. Baltic Ivy (variegated creamy edge) would combine well too.
large plastic planter boxes - front yard landscaping ideas