Over at Inhabitat I came across these great solar blinds.  I bet if these go into production, the dude who designed these will be as rich as the paper clip guy!  It was an entry into the Greener Gadgets Design Competition, called Blight. They soak up the sunlight during the day and give it back as light at night.  I would definitely get a few sets – they may be easier to clean than my wooden ones.