1. Heat a large skillet over medium-high heat. Coat pan with cooking spray. Sprinkle shrimp evenly with 1/8 teaspoon salt. Add shrimp to pan; cook 2 minutes on each side or until done.
2. Combine oil, juice, remaining 1/4 teaspoon salt, and pepper in a medium bowl; stir with a whisk. Combine greens, squash, basil, and oregano in a large bowl. Add oil mixture; toss gently to coat. Divide salad mixture evenly among 4 plates; top with shrimp.