Consider your interests. It can be ideal to associate your interest with your room theme. There are many possibilities here. For example, if you like soccer, you can get a whole line of soccer-themed room accessories if you are up to it. If you just love those giraffes, you can get creative with tall brown and yellow furniture. Alternatively, if you are a fan of antiques, try collecting them for your room.
Imagine what items are associated with your topic. List as many ideas as you can about how you can connect your topic to your room. Remember to be creative and see this in ways you never thought of before.