Machine stitching conductive thread to create a simple circuit on my Christmas card. The conductive thread stitches connect a 3V button battery with an LED. Two loose ends create a simple switch that can be closed by tying them into a bow.
While this version of the card requires the recipient to own or purchase two crocodile clip connectors, I created a simple battery holder in later versions by crossing the two strips of conductive tape and sandwiching the 3V button battery in between.Please see illustration for optimal solution (though it does not correspond exactly with the photos I took of my first example) >> Download illustration
I reproduced this Christmas card 20 times, mailed them out from Austria and hope that they all arrived.