Bring water to a boil in pot. Add the orzo, stir and cover. Simmer for about 7 minutes. While orzo cooks, combine the basil leaves, garlic, pistachios and parmesan in a food processor.
Cook pasta according to directs on package. Be sure to just cook to al dente stage. Drain and return to pot removing from burner. Stir in oil and all remaining ingredients and mix well.
Remove and discard skin from chicken. Sprinkle with garlic, thyme and salt. Place in 4 quart slow cooker. Pour orange juice and vinegar over chicken. Cover and cook on low heat for 6-7 hours. Remove chicken from slow cooker; cover and keep warm. Discard juices. In a large bowl, toss together greens, tomatoes, olives and feta; divide among serving plates. Slice chicken from the bones, discarding the bones. Top each salad with some of the chicken. Drizzle balsamic over salads. Makes 6-8 servings.