Many edible decorations are available in the stores today.
Though you may buy coloured sugars, iced leaves, mistletoe, etc., they can be made at home too. Add a few drops of green, yellow, red or desired colour to it. Add 2-3 drops vanilla essence. Close lid tight and shake the jar vigourously till the sugar is uniformly coated with the colour. To make iced leaves, etc. , prepare 1 cup basic butter icing and add the desired colour while beating.