Children adore different unusual things. I found this "document" on https://fangirltastic.wordpress.com/2014/06/09/ministry-of-magic-i-d-card-free-printable/ and liked it very much. To make it more convinient for my students I changed it a little. I made a card for me to show kids the example. I don't know what would be better to let them buy it in the magic shop or to work with it at the lesson.