What are some ways I can repurpose leftover gravy?

Make Jersey style Disco Fries ( Fires with Gravy & Cheese Sauce) or Poutine which can go all different kinds of fancy... both would be less terrifyingly fattening with the Patricia Wells Genius baked Frites. My husband would drink gravy if I let him... he'd love if I made him a poutine

Freeze in ice cube trays, use as needed to deglaze pans, beef-up (unintended possible pun) sauces, risotto etc.

Yeah I say make a savory/meat pie or shepherd's pie, or just the next time you make mashed potatoes. However, would also be great for open-faced sandwiches. Of course, depends on the base for the gravy in question.

Add to quinoa, rice or another grain with some veggies.

I'll add it to chicken noodle soup (if it's chicken gravy) or use it for pot pie.