aren't you supposed to bring in something you've done yourself? I just brought 2 digital photos that I took of my cousins wedding, someone talked about her tattoos, another person talked about his hair
and another guy talked about his drawings that he did while in Sweden at a yound age.
don't stress too much about it! Just bring it in, say when you did, why you did it and at what environment setting (eg wedding, sweden). Go into details about it. Most people just talk about how it's a personal thing of theirs (eg. the girl got a tattoo of a loveheart or something in order to express how much love she has towards her mother) and then some people will just start questioning
Good luck!