When we had those delicious Arancini Balls at a restaurant recently, they were served with a marinara sauce. It was a perfect start to a fantastic meal, and could be inspiration for you, too, if you also have pasta sauce to use up. You can also make these Arancini as small or as large as you like; just be sure to adjust the cooking time and keep an eye on them to make sure they crisp up but don’t burn.
Also, I used regular, fine bread crumbs here. But you could season the breadcrumbs for a variation on flavor (Italian seasoning, red pepper flakes, more cheese), or use different breadcrumbs for a change in texture (Panko, crushed saltines, homemade breadcrumbs).
I figure if you’re already playing with leftovers, why not use up other items in your pantry or refrigerator for a whole new meal?!