Community Gardens
From Open Community Foundation
Small community gardens/farms would benefit all in the area.
Inspired from:
http://www.youtube.com/watch?v=jV9CCxdkOng
Just need a set plan for these.
Housing Squares
The idea of having houses laid out in such a way that makes a common area that a number of houses have between them, which can contain a greenhouse/garden.
For example, four houses, at right angles to each other so there's a square in the middle, could give space to grow food for the residents of the houses.