What to do with all of our milk cartons?

We have a bit of a dilemma at Balgreen Primary. Everyday we go through lots of milk cartons at school so we have been trying to think of different ways of upcycling them!We have made parrots for Pirates, and baby dragons for Fairy Land. Primary 3 have been learning all about the Ancient Egyptians, so they decided to build an enormous pyramid using milk cartons! It was quite a feat!