Cassie here is a good one to try.
1/2 cup stick butter softened
1/2 cup Crisco shortening
1/8 teaspoon salt
2 teaspoons vanilla or almond extract
5 cups powdered sugar
1/4 cup half-and-half cream , milk, or water
The secret is to beat icing until nice and smooth. If it is too think add a few drops of liquid or if it is too thin add a small amount of powdered sugar