From the Blessing of the Creche - Lutheran Service Book Agenda

Almighty and everlasting God, on this night You caused Your only-begotten Son to be born of the blessed Virgin Mary for our salvation.  Bless this creche, which shows the wonder of that sacred birth, that all who behold it may ponder and adore the mystery of His holy incarnation and may joyfully partake in His divine grace unto life eternal; through the same Jesus Christ...  p. 311.