HELP AND FAST! My friend's birthday is tomorrow and need help celebrating it at school?

she is turning the big 13 and everyone has something planned, balloons, decorating her locker, singing, bringing in cupcakes, decorating her seat in homeroom, and she has been my friend the longest and i need something super that will knock her off her feet and show her how good of a bff she is. also remember money is tight, thanks!