I started by making a sample from white paper to figure out how the box went together. It was pretty easy to understand which way the dotted lines needed to be folded, and how the tabs intertwined to create the flat bottom.
I used some scrapbooking paper with a heart print to form my box. If I try this again, I'll use a thicker paper. Cardstock the thickness of a manila folder would be just about right.
A heart-shaped box, made of hearts. I'm filling this with candy and giving it as a gift.
My inspiration came from Pinterest.
Unfortunately, I could not locate the original designer.