Whisk together balsamic, parsley, green onion, and herb dressing mix. Toss with cooked shrimp, artichoke hearts, olives, and tomatoes. Allow to marinate 8-24 hours.
Right before serving toss with cubed feta and a few tablespoons of basil.
Recipe by Supper for a Steal at http://www.supperforasteal.com/marinated-shrimp-and-artichokes/