Snow tags are a form of free advertising, using the natural world around us to our advantage.
Here the TV channel Extreme Television have created a snow tag, they used it in a very uncontrolled manner. They placed the stamp anywhere and everywhere, the idea of a snow tag is great, but if it was thought out more then it would have more of an effect on the viewer. This is not a sustainable form of advertising as the snow melts along with the advertising. There are more sustainable ways to advertise using the natural world. Clean advertising and moss advertising are just a couple of examples.
For me, the idea of using the world around us (the natural world) is fantastic, I love designing for a digital medium, however it is very refreshing to see things that have a natural feel. I do not feel that as a digital designer that I should be restricted from using elements from the natural world.