Here are some examples:
This is a playground designed by a Netherlands-based team called Carve.
This is the Google headquarters called the Googleplex.
This is a Wii ad put up all around the city called "Wii'il Remember" featuring some old school game characters made of post-it notes.
This is the Film and Media Research Center of the University of London's Birkbeck College.
And this is the website of a big-scale installation artist: