My mother has expressed to me several times her disappointment at not having any printed pictures since she got her iPhone. I usually remind her that she can get her pictures printed if she really wanted to -- but after several years of this, I realized that the hassle of getting them printed is enough of a barrier that it's never going to happen.
So I'm working on an app that will allow for automatic printing and delivery of pictures from mobile devices:
You can add pictures to your PrintStream account and it will choose a certain number each month to print and deliver to you. We also are thinking about an even more automatic method, where the app will algorithmically choose from all of your photos each month without having to explicitly add them to your PrintStream account. This is definitely a feature my mother would want, but we want this to be opt-in to protect the privacy of the users.
I'm still prototyping the app using React Native but I'm excited to get it up and running.