Riddel Architecture demolished a house in Australia and reused 80% of the salvaged materials to create this modern home.  Even the new materials that were used in the construction of the Hill End Ecohouse  are made of recycled materials, and the home is entirely energy self-sufficient. Love how this house shows that being environmentally-conscious can be beautiful as well.

As a special surprise, check out the original structure below.  The before-and-after effect is particulary striking!

Via Dezeen, as suggested by my colleague Véronique!