Soften ice cream to a soft serve/yogurt texture. Evenly divide ice cream into three bowls.
Place red food coloring in one bowl and blue food coloring in the other, using a whisk beat each bowl until color is well blended.
Layer bottom of glass with red ice cream, then plain vanilla and blue ice cream, using long spoon or knife drag it from the bottom to the top, stirring in between to mix the color (do not overmix).
Optional decorating idea: Finish with whipped cream and red, white and blue confetti