The Christmas stamp is also a wold wide tradition that originates in Denmark (1904). The Christmas stamps are not real postage stamps in Denmark, but instead a stamp where you support the sponsering of a camp for obese children when purchasing a Christmas stamp. Back in 1904 the cause was children with tuberculosis. They come in sheets with 10, 30 or 50 pieces, and often the stamps have individual motives on the sheet.
Found a couple of the stamps depicting our weaved heart tradition :o)