In a large pitcher combine carbonated water, ginger ale, and grape juice. Pour over ice cubes in chilled champagne glasses or wine glasses. Serve immediately. Makes about 20 (4-ounce) servings.
For Party Ice Cubes:
Place small pieces of fruit (berries or tiny citrus wedges), small sprigs of fresh mint, or 1/2-inch strips of orange peel into the compartments of ice cube trays. Add enough water to fill, then freeze.