An ice ring in a punch bowl will last longer than ice cubes. Be sure the size of the ice ring will fit the punch bowl.
Want a special ice ring? Fill a ring mold with crushed ice. Arrange kiwifruit slices and raspberries in the ice so fruits stick up above the top of the mold. Freeze 15 minutes; add cold water or juice to fill mold. Freeze overnight or until solid. To remove, run hot water over bottom of mold to loosen.