LOST!

Don't misunderstand my topic that I choose for my photography is not "Lost".
I am just saying that I am not sure on what should I do because my earlier idea was to take photos of  old buildings.
So, when I discuss about my topic with my lecturer he ask me to look beyond.
Thus, I was inspired by this guy  Bansky. He is a graffiti artist.( I got to know him through my lecture)
What I thought is like combining both old building and graffiti together.
Something like the picture below, but I couldn't get the reason of me doing this so I didn't want to do something like this.

But now I am not so sure about what I should do..