Heart shaped box, sorta – papercraft…
Kirigami – heart shaped paper craft.
Open heart kit – The Open Heart is an LED matrix of individually addressable LEDs. It can be used to create a brooch or bag light with highly customizable animations. It can be configured so that you can temporarily attach it to fabrics with headers that you simply push through, or you can configure it to be sewn into a project using conductive fabric for a more permanent setup. You’ll need an Arduino to complete this project as well as a soldering iron and basic hand tools.