I would love to see a camera added as an item, that can then be used to take screenshots at any given time or place in the game. Players could purchase additional rolls of film, and photo albums of various sizes in order to hold their pictures. The albums could be left public, kept entirely private, or shared by invitation with friends. Alternatively, rather than buying additional capacity, players could learn Photography skills in order to take better and store more photographs.
There could also be quests designed around taking pictures in various locations - a virtual scavenger hunt sort of thing. Or maybe you'd be tasked with taking a picture of someone wearing a panda hat.
It would definitely be an undertaking, but I think it could be fun!