This is the easiest homemade icing to make

Quick and Easy Powdered Sugar Icing 

2 cups powdered sugar (sifted)
1/2 teaspoon vanilla
2 tablespoons milk 

Mix the powdered sugar with the vanilla and milk. Then add more milk a 
bit at a time until it is thin enough to drizzle over a cake. Once you've iced 
your cake, it's best to let it stand for one or two hours. 

To make chocolate icing, add two tablespoons cocoa powder when you mix 
the powdered sugar and follow the rest of the recipe above. 

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Thick Vanilla Frosting 

1 cup shortening
2 teaspoons vanilla
4 cups powdered sugar (sifted)
4 tablespoons milk 

Beat together shortening and vanilla for 30 seconds medium speed with 
an electric mixer. Add 2 cups of powdered sugar a bit at a time while beating. 
Then add 2 tablespoons milk. Slowly add in the rest of the powdered sugar and 
the rest of the milk until you get the right thickness for your frosting. 
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Cream Cheese Frosting 

1 6 ounce package cream cheese
2 teaspoons vanilla
1/2 cup butter
4 cups powdered sugar (sifted) 

Beat together cream cheese, vanilla, and butter until fluffy. Slowly add 
powdered sugar 1/2 cup at a time until the frosting is the right thickness to 
spread on cake. Keep in the refrigerator until serving. 

The "tangy" cream cheese frosting flavor is a real hit on top of all kinds of cakes. 

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Chocolate Butter Frosting 

1/2 cup butter
1/4 cup cocoa powder
1/3 cup milk
2 cups powdered sugar (sifted)
1/2 cup chopped nuts (pecans are nice) 

Heat butter, cocoa, and milk and bring to a boil. Add powdered sugar 
and beat until nice and smooth. Add chopped nuts and stir. 
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Peanut Butter Frosting 

2 tablespoons butter
1/2 cup evaporated milk
1 cup sugar
1/2 cup peanut butter (smooth or crunchy)
1 teaspoon vanilla 

Heat butter, milk and sugar and boil for 2 minutes. Add peanut butter and 
vanilla and stir until smooth.