The phrase they are using for advertising these peep hole decals is 'Pimp Your Door'. I've actually been pimping my door for years. I started by removing the backing and glass of a picture frame I had and attaching it over the peep hole (on the inside of the door). Then I noticed they had done the same thing on the TV series Friends. So on one of my visits to NBC Studios in New York, I just had to buy the Friends peep hole frame. You can see it on my door...
I also pimp the outside of my door to entertain anyone coming to the door and to put a smile on my face when coming home.
It's fun that the door at my current house is made of metal rather than wood so I can fill it with magnetic items. I just have to make sure they are heavy duty magnets or they will fall off whenever the door gets closed too hard.
I recently saw small magnetic picture frames like the one in the above photo, at [Cost Plus] World Market for around $1.99 each. These are fun because you can put whatever you want in them. And change whenever you feel like.
If you've pimped your door, send me a picture. I'd love to see it!