One Sheet Paper Box
If you're in the need of a quick gift box this could be your solution. And is super easy to make.
Score
Take your 12x12" paper and score at 3" and 9". Rotate your paper and score at 1", 3 1/2", 6 1/2" and 9".
Here is a template as well to see how it should look like.
Cut
With the 1" score line facing you cut away the corners down to the 3 1/2" mark, then cut further towards the 6 1/2" score line. Rotate your paper and cut towards the first score line.
Fold & Burnish
Fold and burnish all the scored lines.
Assemble
Lift the side flaps and adhere everything using double-sided tape or glue if you'd prefer.
Finish
Round the corners of the lid.
You can close the box either by tucking the lid inside or fixing it into place with a sticker.