The fun people at Photojojo are talking about a thing called Smooshtacts. Take a photo of a friend with his or her face pressed firmly against a glass surface and then make it that friend's contact picture in your iPhone or whatever.
Here's a very good example of the results found at Photojojo:
I don't have a phone that stores pictures, but it was still fun for the kids and I to make smooshy faces against our sliding glass door.
Here are our results: