about narrative presentations
A narrative presentation can be about anything you wish. It can a serious, funny topic that has been taken from the internet, the newspaper or you yourself can be the creator and make a nice creative topic yourself. Ideas for topics can come from anywhere. As you say that you just have to keep your ears open. People have gotten topic ideas from places such as TV shows, to newspapers to even jst talking to their friend.
The Format
The format of making a narrative presentation is almost the same as the one for a research based. A narrative presentation can be about anything.Just like most of the other writing styles, narrative too has sub points or sub topics within a wider topic.