Photographs, Video, Web Streaming
You are failing to understand that apps really are not even necessary.
A video can be played full screen in portrait.
A photograph full screen.
Perhaps a browser that opens a Fleshlight POV porn site that will play an interactive Flash/HTML5 video with your unit (pun intended)
Skype, Facetime.
An app is merely for going to extremes that we haven't touched yet but not even yet required.
You're welcome!