We used Strawberry Jello Mix in our recipe. And, while my daughter absolutely loves the "pink" color that this results in, you can certainly try lots of different flavors to liven things up!
I've also seen versions of this recipe with fresh fruit folded into the mixture. Or you could garnish this Strawberry Cool Whip Pie with a fresh fruit of your choice!
This is a great recipe to make with the kids. Let them pick out the color that they want and let them help in the kitchen, there really is no way to mess this recipe up. But it may be best to let mom handle the part with the boiling water.