Found this simple side salad on EatingWell.com. A few additions make it a great Main Dish Summer salad:
Serves 4

8 cups mixed salad greens
1 cup orange segments
1 avocado, diced
1/4 cup slivered red onion
1/2 cup Cilantro-Lime Vinaigrette, (recipe in separate post)

My additions:
1 Cup Small White Beans
Grilled Shrimp, seasoned with your favorite southwest seasoning. You could also substitute Scallops, or any white fish you like to eat on a salad!

The beans give the salad "staying power" and actually, really add to the texture of the dish.