Continuing with the Vertical Gardens theme I champion, I found this rather ingenious design for one that not only maximizes space, but is quite attractive too. Featured by Green Renaissance, its construction looks a relatively easy design to replicate if you are handy (and so inclined).
A wall brightening and more organically shaped solution is the pot tree, where pots can be interchanged, as well as reorganized to get the desired effect.
The lettuce wall, however, I think is ingeniously simple. It is a good use of vertical space in order to grow ecologically friendly and pesticide free crops, hands stay clean, and it serves as a decorative divider in the planning of a landscaped garden.
If you want a bit of inspiration when it comes to construction, take a look at the Florafelt growers from Plants on Walls - they are created using recycled plastic bottles and an indestructible nylon non-toxic fibre. Once the plants have 'settled in', the effect is amazing!