You can choose your favorite color or a specific theme. Some of the popular themes are beaches, movies, sports, parties and book clubs. Put a colorful paper inside the locker door to match your feelings. You can change the paper according to different seasons. You may place a holiday-themed paper during winter and a flower-themed one in spring. If you are interested in sports, then you can put a poster of your favorite sports star or sports tickets inside the locker. If you choose a wildness travel theme for your locker decoration, then put the attractive photos or posters of different wild animals. You can also decorate your locker with photos, cuttings from the magazines or cloth flowers. 以下哪个选项是这一段的主旨?