I've got a piece of sheet music at home with the song "All I Want for Christmas is a Concertina" on it. That could work for a Morris side. It's not a familiar tune, tho, so you would have to do some extra work.

Since we've heard from OZ in this thread, I'll mention Kevin "Bloody" Wilson's lovely "Hey Santa Claus, You C__t, Where's My F____ing Bike?"

Joy of the Season,

Jerry