Many green design enthusiasts are aware of greywater systems (using non-potable water where filtered drinking water is not required, for example in irrigation or flushing of toilets), but have considered the design and construction to be complicated and expensive. Sloan Valve company has developed a system that captures lavatory water and diverts it into the toilet tank for flushing, saving as much as 5000 gallons of water per year.
http://www.sloanvalve.com/index_AQUS_Greywater_System_ENU_HTML.htm
Kichler has created its Design Pro line of LED lighting to be used in an undercounter application in kitchens. Product could also have retail uses. The light source (lamp) is said to operate without failure for 20 years.
Ecorock Drywall from Serious Materials is made from 80% recycled materials, making it a great choice for projects in which sustainable design is a priority. 
Residentiality - An Architect's view on Residential Design 