I always love to find a new way to use frozen meatballs--either commercial or homemade and frozen. This is a particularly good (and hearty) soup. I think you will enjoy it. I found a tiny elbow macaroni in the Mexican section of the ethnic aisle of the supermarket; I thought it worked very well in this recipe. It's name is Pasta Alimenticia (La Moderna brand). I also substituted Navy beans for the kidneys since we like them best. The recipe comes from "Slow Cooker Magic" by Rehberg and Conway.