I found a vertical garden concept on Kickstarter. They are looking for funds to launch their project.

They describe their project below:

As urban dwellers, it can be difficult to find space to exercise our green thumbs. Urbio is a magnetic system that will help transform any wall or ferrous surface into a beautiful vertical garden.

Each pot is made of eco-plastic and is equipped with large neodymium magnets that are strong enough to hold almost anything to the wall. The wall plates are modular, and can easily be mounted to any wall.  Mount just one Urbio pot, or fill your wall with them.

Alternatively, each pot comes with its own individual puck that can be used to mount to the wall.  These pucks can also be used to attach pots together for a nice centerpiece.

They are here on kickstarter to raise the funds to complete the tooling portion of this project.