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.