Wontons can be filled with so many different fillings, seafood (espcially lobster, crab, or minced shellfish), beef, chicken, pork, cheese, or any combination of the above.
With that in mind, taylor your broth to the wonton filling.
For chicken, I can't add much to what has already been said. But for beef, make a mushroom broth by simmering freshly sliced mushrooms (about a half pound) in 2 cups of water for twenty minutes. Remove the mushrooms, and add a little soy suace, then taste. Add more until the broth is ballanced. Then add a 1/4 tsp. powdered ginger. Make you wontons and cook in the broth. If you want, add a tbs. of chopped chives to the soup..
For seafood filled wontons, make a shrimp, or clam broth
Be creative and think about the flavors and how they play together. You can create so much more that traditional flavors, and expand your soup repertoire
Seeeeeya; Chief Longwind of the North.