David Hood’s “Green Wallplug” takes inspiration from the underground activities of guerrilla gardening, and is designed as a new tool in the effort to green our needlessly dull urban spaces. The wallplug is a composite of compressed dried soil and corn starch, both of which provide food for the seed(s) inside the plug. The seed germinates once the plug planted in a wall and watered in. The production technique used for the wallplugs is press moulding, with a two-part mould and a three-part ram. They are then dried for five to seven days for easy removal from the mould.
.: i will build some of these 
green guerrilla?!
cool : )