I grabbed some 2 sided mounting tape (didn't want them to have glue when I couldn't be right there overseeing!) and the box of popsicle sticks. They happily set to work making their boxes.
When they were finished putting the on popsicle sticks, I took the boxes out to the garage and spray painted them.
When the spray paint was dry, I let them decorate the boxes with stickers. They had a blast. Jayna uses her little box to hold crayons and pencils, Xander uses his to hold his sunglasses.