The entire visual world is an incredibly interesting place. If that is not sufficient "subject" for you, then I propose that you are in a 'world' of trouble, and had best get out while you can, because this game (of photography) is not for you.
You have the tools, the materials, the sometimes gorgeous light, the beginnings of a subject calling you. You can begin taking terrific photographs anytime you are ready. So why aren't you ready? What is holding you back? We are all using the same, or similar materials...you have the skills...what are you waiting for? Permission? You have permission.