How about
cucumber slices (with or without sliced onions) in a mayo dressing or a vinegar sugar water dressing to taste.
a lettuce salad with radishes carrots tomato cucumber shredded cheese croutons and offer a couple of diff dressings
Fire and Ice is one of my favorites. it is made with small size veggies as in baby lima bean baby peas mini corn on the cob diced onion diced tomato and any small veggie you like. the dressing is vinegar sugar water. You can search online for the recipe if you want better directions.