We had a project a few weeks back where we had to create a new beverage and our team came up with some neat stuff. Here is the design of our bottle. I used Cinema 4D to mock them up. The tops have a removable piece of foil with a short URL that you can type into your mobile device. You can then stick the cap to the spot where you took the photo, thus leaving your Landmark for other to see. People passing by can then type in the short URL and see the fun types of photos people 'left' for others to see. Additionally, all the photos will be aggregated in to an interactive website for anyone to browse. Cool right?