Using a rain barrel can save you a significant amount of money in a season. For each inch of rain that falls on 500 square feet of roof, you can collect 300 gallons of water to use in your garden, or your lawn.
The rubble trench is a cheap and effective foundation that combines drainage with load distribution. The basic principle of it has been around for thousands of years but American architect Frank Lloyd Wright brought it into the 20th century. More at www.naturalhomes.org/permahome/rubble-trench-foundation.htm
DIY Vertical Wind Turbine From Washing Machine Motor | Brilliant DIY Wind Turbine Design Ideas For Living Off the Grid
DIY solar food dehydrator. Like this design, as I read that foods dried in sunlight were much more nutritious than foods dried in the dark.
Build a #10 Can ROCKET STOVE: It Cooks an Entire Meal With Twigs!
log cabin construction
Rainwater Harvesting Underground Water Tanks (Re-use Tank)