These are specialty flavored frostings. You buy the base frosting and then choose a flavor packet and mix them to create unique flavors such as: Cinnamon Roll, Bubble Gum, Chocolate Mint, etc.
I have created 24 recipes for them which can be seen here.
If you're feeling creative Duncan Hines is currently having a contest where you can submit your own recipes using Frosting Creations with a chance to win a trip to the test kitchens and take a baking class with a Duncan Hines chef. Click here!