Any type of veggie is usually fine with me (except celery....yuck). I like radishes, cucumbers, Kalamata olives, raw yellow squash, avocado, mandarin oranges, arugula, pears, pecans or walnuts, that kind of thing. I don't make lettuce-based salads anymore. I use chickpeas as the base.
As for dressing, I usually just use olive or hemp oil, lemon juice, salt, and pepper.