More to explore:
Cardboard box maze
Cardboard Telephone Tutorial
Cardboard Tube Giraffe
DIY: gift boxes covered with book pages
Babysitter box: I will leave - rules, bedtimes routines, ideas, emergency contacts, instructions for TV/electronics...plus snacks, takeout menus, etc.
Make cardboard cars for your children and have an indoor drive in movie!
pie boxes for take-home desserts
a Marble Run made from a cardboard box
Chairs after repainting Repainted chairs which are picture frame/trinket boxes from Hobby Lobby. I removed the acetate and painted the cardboard backing to match the chair color and design.