You put them on your Christmas tree together with lights.
ornaments
It is a bush with hard shiny leaves and bright red berries used as decoration.
holly
It´s a piece of flavoured hard candy shaped like a walking stick.
candy cane
You hang it on door as a decoration at Christmas.
wreath
It is a plant with small shiny white berries that is often used as a decoration. There´s a tradition of kissing under it.
mistletoe