Would you lease your window space to advertisers to make some extra cash? A Dutch startup called Add My Window is allowing city dwellers to rent out their public facing windows to companies looking for alternative ad space. Advertisements come in the form of large stickers that get placed inside the window. The stickers provide vivid image outside but still allow some light to pass through because they contain hundreds of small holes. According to Pop-Up City , Add My Window "allows people to register for an account via their website and list the windows which they would like to rent out. On the very same website, advertisers can have their pick of windows on which they choose to promote their business. There is an option to select the duration of time which an ad will stay up." Sure, you'll tick off your neighbors or your landlord with these advertisements. But if you're having trouble with the rent or mortgage, A...