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.
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.
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