Frosty Graham Crackers

In a large bowl and using an electric mixer at low speed, beat the sugar, butter, and vanilla extract until you get a good spreading consistency. Add more sugar or milk, if needed, to achieve the right texture. (Note: if you plan to pipe on the frosting, make it a bit stiffer.) Divide the frosting into smaller bowls and stir in your choice of food colorings until blended. Makes about 4 cups.