Chillin' Out Pasta Salad

Chillin' Out Pasta Salad:: 2 1/2 cups med. shell pasta, 1 cup plain yogurt, 2 t. brown mustard, 2 t. salt-free herb seasoning, 1 1/2 cup chopped celery, 1 cup green onion, 1 lb small shrimp cooked, 3 cups tomatoes chopped. In a seperate bowl mix yogurt, mustard and herb seasoning. Add cooked pasta, celery, and onion, mix well. Chill for atleast 2 hrs. Just before serving add the tomatoes and shrimp. Yields 12 (1/2 cup) servings. Sounds yummy, haven't tried yet.