I saw four angels atop a Christmas tree!
Those are from a wonderful papier maché artist in Mexico City and they always grace the top of our trees.
Actually the Fourth Day of Christmas is its own special day in Spain. It's known as the Día de los Santos Inocentes when the Catholic Church commemorates the Massacre of the Innocents by King Herod after the Three Kings visited him telling him of the birth of a "King of the Jews" in Bethlehem in Judea.
On the non-religious side, it's the equivalent in Spain and most Latin-American countries of "April Fool's Day"! In other words watch out for practical jokes! ;o)