1 cup solid shortening
2 pounds confectioners/powdered sugar
1/2 teaspoon salt
1 teaspoons clear vanilla or other flavoring (use clear flavoring to get white icing)
1/2 cup hot water.
Dissolve salt completly in hot water.
Combine all the ingredients in large mixing bowl and mix at slow speed until smooth. If stiffer icing is needed, or if the weather is very warm, add a little extra powdered sugar.
This icing is good for several months if stored in airtight container and kept at room temperature.
To color, use gel food colors.
I made the below baby boot using 3 large marshmallows and icing.