On the Jehovah Halleluliah album I have, Harry Belafonte: Christmas is coming, the goose is getting fat / Please put a penny in the old man's hat / If you haven't got a penny, a ha'penny will do / If you haven't got a ha'penny then God Bless You! (Can be done as a round or canon, I believe). I love that one - does saying God Bless You make it religious? It seems to be about what I consider the true secular meaning of the holiday, being goodwill to others, especially those less fortunate.