How do i make my teen bedroom look cool?

It's medium sized. And has 2 closets. It's also yellow. And none of the things I moved in with match this yellow color. My dad said I could get new furniture and decorate but we canlt paint because we are renting. Anyways. I'm sixteen and I want my room to be fun and cute. Clean and mature. I don't want many other colors. I want yellow to match and be complimented. I already have a bed, keyboard and desk with chair. I have carpet so no rugs. Anyways, help? Decoration and furniture.