The wooden buttons are from Dollarama, and they've been sitting with my craft stuff for a couple of years. They are not varnished so they do not hold up well in the washer and dryer. They were also attached with hot glue.
The tree stamp was stamped 3 times, all in the same corner, on the inside of each card.
The cards took about 2 hours, roughly, but it was much easier than going out to buy Christmas cards, and much, much cheaper.