Ideas for using cardboxes
Cover them with pretty contact paper and use them for storage.
Here a few cute ones: https://www.hometalk.com/3681960/20-amazing-cardboard-box-ideas
I cut mine into 3inch strips and use them to place between wall & fireplace etc... so your paint goes where you want it. And it stays straight!!
Here is a cute craft I made with my class for the holidays using a cardboard box https://www.homeroad.net/2011/12/recycled-rudolph.html