We'll, we've had three fortune 500 companies request using holograms in ads in the last month so I believe we will start seeing them more and more. They might become popular or really cool or just be gimmicky. I'm going to say the latter until someone actually figures out how to do it well. Holograms right now are very ghetto. Here's a few video of what people are doing right now:
If you want to make one of your own (this is what I did): You need transparencies from any office place, this file - warning! autodownload!, an exacto, and a photo on your phone. There is a little dark gray square on this car image. This square should be the same size as the square made when your transparency is folded. Cut and fold the transparency based on the template linked about. Black is cuts and red is where you score / fold it. Open file on phone. Place your transparency on phone. Done. Files can be downloaded here: http://steves2make.yolasite.com/