Machine stitched Christmas Cards

I've been making Christmas cards, either for the next Craft Fayre if it is before Christmas or for use myself at Christmas.

So far there are only two designs, Christmas trees and Gingham hearts. I use a template for the trees and roughly cut them, the hearts are freehand, and every one is different. I like that it gives them a bit of character.
I hold the shape in about the right place with my fingers then stitch it on with a sharp sewing machine needle and red thread (or whatever matches the card). I snip the threads and put with an envelope.
The card is A5 card manually folded in half.

 I've made more of the trees and fewer of the hearts.