Since you probably don't want every surface in your house of the future illuminated
, Micro Reactor System has come up with a solution to make curtains that are a bit more practical but equally futuristic. Their flexible electronic "curtain" consists of two plastic panels with liquid crystal molecules in between them, which can be activated to make the curtain totally opaque, but are clear when turned off. It's apparently possible to make them in different colors as well, although it doesn't seem like one curtain can display more than one color. Like most things that we really, really want, there's no word yet on pricing or availability.