The "call letters" for going green is RRR - reduce, reuse, recycle.  An extreme example of reuse is the Cosmic Muffin, once a Howard Hughes TWA-owned Boeing 307 Stratoliner.  Destined for the scrap heap, the 307 was rescued in 1969 and converted into a "sleek and uniquely sensational motor yacht."

Yes, a boat.  Planeboats.com