If you are having trouble finding items like Asian beef meatballs or pre-chopped lemon grass, go to a Vietnamese supermarket. They will both be in the freezer aisle.
Add anything that you think will taste good with the Ramen. Be adventurous, but just be sure to cook it thoroughly.
Chopped lemon grass is also tasty if added to the seafood.
For a seafood theme: add Squid, shrimp, crab, and salmon.
If you don't like the texture of Ramen, for a more thicker noodle, try Neoguri; They can be found mostly at Korean supermarkets.