Place Stars throughout your school and have your children follow them to a prize. Then talk to them about how the wise men followed a star to find Jesus.
A Christmas spin to pin the tail on the donkey. Cut out a baby shape out of paper. Then make a manger shape and let your children place Jesus in the manger.
Put a manger and babydoll in the classroom. Let your children pretend to be wise men, Mary and Joseph and act out Christmas Day
Fill a plastic or glass jar of water about two-thirds full of water. Talk to your children about how when they were born they had not sinned and that they had pure clean hearts (like this water), but then as we all get older we do things that aren't pleasing to Jesus, teacher, mom, dad, grandma, grandpa, etc. and when this happens or hearts aren't clean anymore (add a couple of drops of food coloring to the water and stir)
Then tell them that their is good news. Jesus tells us that if we come to him and repent he will forgive us (add bleach to the water) This is a great story an example to the children about how Jesus Loves us no matter what