I make a conscious effort to use up leftovers before they have to be thrown out. My family is more likely to eat them, however, if they're re-purposed into something new instead of simply warmed over. From time to time, I post "Use It Up Tips," ideas for turning boring leftovers into something more exciting.
When I frost a cake or cupcakes with canned frosting, I never quite use it up. A great way to use it up is to frost plain cake donuts. Add sprinkles and you have a fun snack for you and/or the kids!