This first buttercream frosting recipe is the one my aunt and I were taught to use when we decorated cakes years ago.
Decorator's Frosting
1 stick margarine (allow margarine to soften before mixing)
1/2 cup Crisco (shortening)
1 box 10X powder sugar
1 teaspoon butter flavoring
1 teaspoon vanilla
2 tablespoons milk
With your mixer on the low speed, mix the margarine and Crisco until smooth. Slowly blend in the other ingredients. Then beat at high speed until fluffy. Chill before using frosting for decorating. The frosting may be thinned slightly with milk to frost cake.