Cool is really in the eye of the beholder, right? So it is pretty hard for us to know what will seem cool to you. If I were you, I would go with something that you think is interesting. I would make a list of topics that might be interesting to you and then try to think which of them would be suitable for making into interesting visuals (I assume that you are doing some sort of a display rather than simply a paper...).
For example, you could do a history of popular hairstyles by finding pictures of people with different ones or even by taking pictures of you with different hairstyles (if your hair is suitable). You could then talk about what the prevalent hairstyles of the various periods of time tell us about the social values of that time.
But again, this could be 100% opposite of what sounds interesting to you... There's a link below with suggested topics -- a lot of it is for younger people, but you might find stuff that you can adapt.