I was reading AdRants and came across the story featuring a Dove ad. In the ad, a "normal" looking woman is madeup and photoshopped into a model for an ad. I knew there was some tooling around with ads and stuff, but this is incredible to watch it all unfold.
http://www.reginaldpike.com/dove/index.html
While it's a powerful ad, I can't shake the urge to go Photoshop myself and see what happens.