Nothing says childhood — or sparks more imagination — than a plain old cardboard box. {Remember Christmas? When you painstakingly wrapped the extra large bike box only to discover your mini-me was way more interested in the box itself? At least, temporarily…} So in celebration of Earth Day, we’ve pulled together some fabulous cardboard box play ideas from some of our favorite blogs.

When’s the last time you got creative with cardboard?

Green Grocer Cardboard Box from Ikat Bag

Cardboard Box Plane from MiniMocha

Cardboard Guitar fro MiniEcho

Cardboard Box Castle from Savvy Housekeeping

Cardboard Oven from KidsModern

Cardboard Box House from Sweet Paul