I used raw shredded cabbage, carrots, and noodles and bamboo shoots cooked with soy sauce.
You can use just about anything you’d like as a filling for spring rolls. Vegetables should be either lightly steamed or sauteed and sliced into thin slivers. If you’re using noodles, I find it works best to break them in half before cooking so they’re not too long. Fresh herbs are wonderful to use in spring rolls as well.