“Estrenes” – A lost tradition in Catalonia was for the mailman, policeman or other public servants to give neighbors a seasons greeting card reading “Your [mailman/…] wishes you a happy Christmas and a happy new year”, with a picture of the officer and a symbolic place of the neighborhood or city. In exchange the officer received some money-tip from those neighbors, considered as an extraordinary payment from the community.
P.S.: Happy new year!