A few fun facts about the day we all wear Green: For many years, blue was the color most often associated with St. Patrick. Green was considered unlucky. St. Patrick’s blue was considered symbolic of Ireland for many centuries and the Irish Presidential Standard is still blue. Guinness sales soar on St. Patrick’s Day. Recent figures show that 5.5 million pints of the black stuff are downed around the world every day. On St. Patrick’s Day that figure is doubled.