Combine pineapple juice, vodka, orange flavored liqueur, blue curacao, grape juice, and lime juice in a glass with ice. Shake and strain into a sugar-rimmed cocktail glass.
Purple Sugar Rim: Mix 1/2 teaspoon blue curacao and 1/4 teaspoon grenadine syrup in a bowl. Add 3 tablespoons sugar to a plate and pour blue curacao mixture over sugar. Mix thoroughly. Dip rim of glass into water or rub rim with a lime slice. Dip into sugar.