http://ubuntublox.com/press/ and more current stuff is to be found on youtube, you'll really like the one by changestream video.
We designed it for developing nations. But it is just as good an idea for projects like this. It's not about what we can do FOR people but what we can do WITH people.
Students learn to recycle and the importance of saving the planet by collecting the foam and film plastics they use at home and school. That material is made into building blocks for community groups to use with the homeless to build great homes.