A few years ago I (ron brenner architects) designed an above garage studio apartment for the father (grandpa) of a client of mine.  The apartment was featured in a new book called In Laws, Out Laws and Granny Flats.  I have included a couple of images here.

Now Forbes.com  has picked up on the idea.  Check out the article by Ashlea Ebeling at 10 Chic Granny Flats.