Add the reduced-fat feta cheese, fat-free sour cream, lemon juice, garlic, oregano, and black pepper to a food processor.
To a medium mixing bowl add the tomatoes, cucumber, red onion, lettuce, and olives. Stir together.
Lay out a tortilla and add 1/4 of the whipped feta. Spread out 1/4 of the veggie mixture, making sure to leave a 1/2 inch border around the tortilla.
Roll up the tortilla and wrap in plastic wrap. Repeat with the remaining ingredients.
Chill all four wraps for 30 minutes before cutting them.
Cut the ends of the pinwheels off, then cut the rest of the tortilla into 6 pieces.