OK, this project is pretty ridiculously simple, but either I was searching with the wrong keywords or this hasn't been posted before.
I've seen some of the gift boxes people have made with old LP covers, so while browsing through Goodwill the other day and looking at all the forlorn VHS tapes, I couldn't help thinking, "Hey, these are made of cardstock... surely they could be reconstructed into gift boxes."
Surely they could.
This is my proof of concept box, recycled from a Disney Reluctant Dragon tape sleeve. Dimensions of the finished box are approximately 4" x 4.25" x 1.25"; it's about the right size to hold a large jewelry item or a specialty card game, or maybe a set of small square notecards. I used some white cardstock I had on hand for the box bottom, but I could just as easily have used another VHS tape sleeve, maybe turned inside out so that the inner white side showed.
The basic template was tweaked from Mirkwood Designs' match box bottom template
; I just made two box bottoms, one a bit smaller and with higher sides than the other. They fit VERY snugly, so next time I might reduce the dimensions of the box bottom by the tiniest bit. Also, because of the location of the image on the front of the sleeve, one of the sides didn't have quite enough paper to make fully doubled sides, so I just didn't double that side. No biggie.