I just thought that this was a great idea for gifts for your students. They could be for a birthday, the end of the year, or you could use it as some sort of prize. There are so many things you could do with this. You could even put different paper, besides yellow on it to make it good for holiday gifts (for example you could put gift wrapping paper around it as a Christmas gift).
Just have fun with them and do what you want!
Credit: http://media-cache-ak0.pinimg.com/originals/14/05/cf/1405cf59bc0ff09a85f7707edcab53eb.jpg