One Minute Chocolate Icing - Allrecipes - Used to top cherry cake. No need to whip the icing as described. Just cool in the pan for a couple of minutes, whisking often to make sure it doesn't set too much, then pour over cake.
There are more recipes here, but I liked this one the best: Chocolate Marshmallow Frosting (Cook butter, sugar and milk for 5 minutes, then add chocolate, marshmallows and vanilla. Beat mixture till it thickens and is spreadable.