Break feta cheese into small pieces. Do not crumble.
Stir together dressing and parsley. Stir in feta and remaining ingredients. Cover and chill at least 1 hour or up to 2 days. Serve with a slotted spoon.
Tomato-Feta Lettuce Salad: Tear 1 small head iceberg lettuce and 1 small head romaine lettuce into bite-size pieces; toss together. Arrange lettuces evenly on 4 individual plates, and top evenly with chilled tomato mixture (do not use slotted spoon). Serve immediately.