Here is a good example for efficient design: Jason Eppink explains how to make a Pixelator. An unauthorized project to free the cities from all this stupid ads on advertising screens.
I think it's pretty much an global problem with does ads, since they trying to convince us subconsciously, how imperfect we are and on what we miss out.
On his website Jason explains how we can get rid off this troublesome ads with very simple tools: <a href="http://www.jasoneppink.com/pixelator/">www.jasoneppink.com/pixelator</a>
