Grilled Shrimp Greek Salad

Name: Grilled Shrimp Greek Salad
Ingredients: 4 tablespoons fresh lemon juice; 4 tablespoons olive oil plus additional for brushing; 1 tablespoon finely chopped fresh oregano; 1 garlic clove, minced; 1 pint cherry tomatoes, halved; 1/2 English cucumber, cut into 1/2-inch pieces; 1/2 small red onion, thinly sliced; 1 lb large (20 to 24 per lb) shrimp, shelled and deveined; 2 (8-inch) pita loaves (preferably pocketless); 1 yellow bell pepper, sides cut off and remainder discarded; 6 oz feta, cut into 1/2-inch cubes; 6 (8-inch) bamboo skewers, soaked in warm water 15 minutes