This is a very tactile and visual way of praying for peace and reconciliation that would work for all ages.
You will need: small blobs of play dough in different colours
Think of and talk about situations where two sides are fighting with each other. This could be anywhere in the world (e.g. wars) or much closer to home and involve people they know or even themselves. Talk about God bringing peace and that it is one of our jobs as Christians to pray for peace:
Ask each child to choose two blobs, each of a different colour.