One big problem with solar power, is finding a place to put all of those big solar panels. People living in apartments can't exactly stick a solar array on the roof, so solar windows are the ideal solution.
We've seen other solar windows before, but they tend to require replacing the entire window. This solution from a Norwegian company called EnSol can be sprayed onto the glass, resulting in a slight tinting. A thicker layer can also be used on the walls for further coverage, then I suppose you could add some solar ivy if you really want the full effect.
EnSol has been developing the spray with help from the University of Leicester's Department of Physics and Astronomy, and hopes to have a product on the market by 2016.