You will need:
polystyrene or cardboard balls
bits of coloured paper
a couple of beer bottle caps
Continue until the bauble is decorated to your or your children's desires.
When complete and dry, cut a piece of ribbon, dollop a small amount of glue onto the top of the bauble and secure the ribbon to the bauble by stabbing the pin through the ribbon and firmly into the ball. Leave to dry.
Keep baubles for many years to come and children get to see their decorations hanging from the family Christmas tree.