Mix the grape juice and water until a suitable blue color results. Try adding blue food coloring to achieve the desired shade. Pour into the plastic cups filling them 1/3 full. Place into the freezer until the start to freeze. Once they do, stick a craft stick in the center of each cup. Freeze until solid.
Mix the yogurt and whipped topping together. Place a layer on top of the frozen blue layer, and freeze for one hour.
Repeat the process given for the blue layer but do it with the cran-raspberry juice and red food coloring. Add a red layer to each cup and freeze until frozen.
Run the outer side of the cups under cold water to release them.
Times are approximate.Nutritional values listed may vary from final results depending on actual measurements and brands used to prepare the recipe.