Sky Garden House by Guz Architects. Wierd, but I think it would be really nice to inhabit. It's also an interesting application of green roofs/roof gardens to a very modern, otherwise steel and concrete design.
facade 243 aphotik: Gaeta Springall Architects designed the 4 Casas houses) project in Mexico City, Mexico. The project involves two towers that each contain two houses that have been built on the side of a steep ravine.