Heat margarine and marshmallows over low heat stirring constantly until melted. Remove from heat - add vanilla and colouring - fold in cereal until coated. On buttered wax paper divide mixture into 5 piles with buttered hands shape into trees. Decorate with sliced jellies (I use sugared gum drops - sliced). I then make a star for the top with the childs name on it. Glue the star onto a toothpick and stick through the top of the tree.