Food.com has a recipe for a simple crushed pineapple icing, About.com has a recipe for a pineapple buttercream icing, and Emeril Lagasse at The Food Network has a recipe for a pineapple icing with nuts.
To make a simple pineapple icing, combine 8 ounces of canned crushed pineapple with the juice, 1 cup sugar and 3 tablespoons cornstarch in a sauce pan, bring to a boil, stir constantly until thick and remove from heat.
To make a pineapple buttercream icing, cream 1/2 cup butter and gradually beat in 4 cups of confectioner's sugar until it is well creamed. Stir in 6 tablespoons of well drained crushed pineapple, adding just enough juice to make the consistency good for spreading. Beat the mixture into a blend. This icing goes well on yellow cake or a pineapple chiffon cake.
To make a pineapple icing with nuts, cream 1/2 cup of butter with 8 ounces of cream cheese. Add 2 pounds of powered sugar, 1 teaspoon of pure vanilla extract, 2 tablespoons of milk, and 1 cup of crushed pineapple. Mix these well and fold in 1/2 cup ground pecans. This recipe makes enough icing to cover a cake with twelve servings and goes well on an Italian cream cake.