Skylar, I’d like to suggest that you read the ingredient list on the Cool Whip container at your supermarket and the instant pudding package. You’ll see they’re full of sugar—mostly in the form of corn syrup and fructose—plus hydrogenated oil ( i.e. trans fats) and a long list of chemicals that are suspect in terms of health.
Next, check out the recipe for White Ganache on page 278 of the Cake Bible. It meets your preference for a whipped frosting with a vanilla taste that isn’t too sugary. To get the different colours you want, you could use chocolate melts instead of the plain white chocolate. Or if you prefer, you can use plain white chocolate and tint the ganache. Just don’t put liquid coloring agents directly into the chocolate or it will become lumpy. Bonus! The recipe couldn’t be easier. There are other possible recipes in TCB—for example, the super-stabilized whipped cream on page 256.
I promise! We won’t kick you out of the forum, if you use a recipe other than Rose’s. But we probably won’t be able to restrain ourselves from encouraging you to consider the use of healthy, natural ingredients in your baking.