To raise money for their small unmanned spacecraft, MIT students are selling ad space on its surfaces, one centimeter at a time in the Million Dollar Home Page fashion.
Boston Globe writes, "On the YNIS spacecraft, there are 121,866 square centimeters for sale inside and outside the satellite, which is about as tall as a washing machine and as long as a Ford Focus. he YNIS spacecraft has better neighborhoods than others. The cheapest property is the "introductory" zone at edges of the satellite's solar panels (It burns up in space, unfortunately.) while the more expensive "bronze" and "silver" zones on the exterior are photographed in orbit by cameras mounted on the solar panels."