This is my go-to icing recipe. I use it on all my cakes and cupcakes, unless otherwise specified.
½ cup margarine
½ cup shortening
1 ½ tsp vanilla extract
5 cups confectioners' sugar
¼ cup milk
In a large bowl, cream margarine and shortening until light and fluffy.
Add vanilla, confectioners' sugar and milk. Beat well.
Put into separate bowls and add food coloring to desired shade.