MARINATED GREEN BEANS WITH TOMATOES, OLIVES, AND FETA

2 pounds fresh green beans, trimmed
1 and 1/2 teaspoon salt, divided
2 garlic cloves, minced
1/4 cup olive oil
1 cup kalamata olives, sliced
2 tomatoes, seeded and chopped
2 tablespoons red wine vinegar
1 tablespoon fresh oregano, chopped 
(if you use dried, only use 1/2 tablespoon, less if you're not an oregano fan)
1/4 teaspoon pepper
2 (4-oz) packages crumbled feta cheese (I only plan to use one package)

Place beans in boiling water with 1 teaspoon salt; cook until consistency you like. 
Drain and rinse. Place in shallow serving dish. 
Cook garlic with hot oil over medium heat 30 seconds or so; remove from heat. 
Stir in olives, next four ingredients, and 1/2 teaspoon salt. Pour over beans, tossing to coat. 
Chill at least 3 hours or overnight. Sprinkle with feta before serving.