I substituted for the chorister on Sunday and thought I'd post the idea I used.
1 picture or toy of Jesus in the manger (I used my Fisher Price manger set piece)
1 small box for the toy to go into
8-10 different layers of wrapping paper
Put the picture or Toy of Jesus into the Box, then wrap it in different layers of wrapping paper.
Tell the children that you have a special gift of Christmas you want to share with them. Tell them that the pianist will start to play a song...as soon as they know the song and start singing it...they will begin to pass the present. The pianist can play the whole song or stop whenever...but when the music stops the child holding the gift will unwrap one layer of the present. You continue to do this until you get to Jesus. Then bare your testimony about Heavenly Father's gift to the world was His Only Begotten Son.
It went really well, and the spirit was present. Merry Christmas.