What does this sticker say? (Characters identified: 萬事如意)
萬事如意 /wan4 shi4 ru2 yi4/ (May everything be as you wish)

This is one of those auspicious sayings people use around Chinese New Year. People often say this to one another, and/or write the four characters on red paper to use as wall decoration around Chinese New Year.

You can certainly use them to decorate your binder. Happy learning!