The idea for the box popped into my head so I modeled it and printed a small version of the box only. Later I saw the Valentine's Day contest, and decided to throw a heart into it for the contest.
I printed the heart at .16mm layers, and I recommend doing something smaller than that, maybe 0.8-1.2 or something.
I included files for the heart and box separately, as well as a file that contains both.
The author marked this model as their own original creation.