There's 3 different versions of a heart-shaped box here: Voronoi, Hearts, and Plain. They take well to some scaling, to what limits I don't know yet. The orange box in the picture is at 75% scale, the blue at 100%. Both were printed at .2mm.
It's my 2nd go at designing something. I'm still learning a lot and still lacking lots of time, but hey, it's looking better each time. Enjoy, and let me know if there's anything that can be improved!
The author hasn't provided the model origin yet.