Leave little notes to yourself on either a small dry erase board, or a TO-DO notepad. This helps with reminders for tests, music things, or just "clean something out of you locker today!" You can also write inspiring quotes!
Locker decorations can be expensive, so why not make your own? You can buy plain magnets from a craft store, then decorate them or attach them to a cup to make a DIY pencil caddy to hang on your locker door.
Decorating and personalizing my supplies makes me excited for school to start. Also, being surrounded by color gives me inspiration while I& doing my assignments. I cant wait to put these designs in the front of my folders :)