Leftover frosting can be used in many creative ways. Here are some ideas from the search results:

1. Spread it over graham crackers or other cookies and sprinkle with desired toppings, such as mini chocolate chips, candy sprinkles, or chopped nuts, for a quick, sweet treat.
2. Pipe the leftover frosting into hulled strawberries.
3. Mix it with a bit of softened cream cheese to make a fruit dip.
4. Dip pretzel rods into the frosting.
5. Use it to rim a cocktail glass with sprinkles.
6. Make frosting-filled dumplings or sweet grilled cheese.
7. Melt chocolate frosting in the microwave and use it as hot fudge on ice cream.
8. Spread cream cheese frosting on a breakfast sandwich with bacon and scrambled eggs.
9. Eat it straight out of the container.
10. Use it to make leftover frosting cookies by adding an egg, flour, baking soda, and salt to the frosting.
11. Pipe it onto a cake as a decorative border or add textured detail to the top or bottom of the cake.

Leftover frosting can be frozen for later use, but it is important to carefully freeze it and remember to use it before it goes bad. With these ideas, you can turn your leftover frosting into a delicious treat and avoid wasting it.