I like black bean and corn salad with chopped green onions and cilantro. You can add diced bell peppers, celery, or cherry tomatoes to add some additional veg.
Also, instead of a green salad, you can chop veggie sticks and use them for dippers in homemade bean dip:
http://www.epicurious.com/recipes/food/views/white-bean-dip-358374
You can also spread on crackers instead of cheese.