An activation campaign for public transport in Belgium:
You can do anything on the bus or tram. To emphasize this idea, discount stickers were put on the inside of windows in over 600 busses and trams. For instance, when you make a picture of a 75% off sticker with in the background a shoe shop, you can actually win 75% off in that shoe shop.
Animated gifs for the website, to help explain the activation in different steps.