“My crown is called content,
a crown that seldom kings enjoy”
We can print any message on our tissue boxes, as long as they are not controversial, these are schools after-all, we can print them. Let's try and keep them empowering messages, not outright advertising. That will backfire.
"Creativity is piercing the mundane to find the marvelous"
The more creative the more they will stand out, teens appreciate cool, and uncool, it's a crapshoot, but I am sure your marketing department knows what's up.