Examples:

• In school, she was the ugly duckling who later became a successful fashion model.
• The old house in the neighborhood was an ugly duckling until it was beautifully renovated.
• He may have been the ugly duckling in the family, but he's now a highly respected scientist.
• The struggling startup was considered the industry's ugly duckling until it developed groundbreaking technology.
• The book started as an ugly duckling, but it eventually became a bestseller.
• She always felt like the ugly duckling among her glamorous friends, but her kindness and intelligence made her truly beautiful.
• The plain, overlooked painting turned out to be an artistic masterpiece, proving itself to be the ugly duckling of the art world.
• The initially awkward and shy student turned into the class valedictorian, proving to be the school's ugly duckling.
• The neglected garden turned into a lush paradise, making it the neighborhood's ugly duckling no more.
• The actor was once considered an ugly duckling in Hollywood but eventually became a leading man.
• The dilapidated building on the corner was an ugly duckling until it was transformed into a trendy cafe.
• The overlooked athlete in high school turned out to be a world-class champion, making him the ugly duckling no one expected.
• The software, which was initially considered an ugly duckling, became the industry standard for graphic design.
• He used to be the ugly duckling in the music industry, but now he's a chart-topping sensation.
• The plain and unassuming book cover masked the literary masterpiece within, making it the publishing world's ugly duckling.
• The neglected park turned into a beautiful green space, proving that it was not the ugly duckling people thought.
• The shy girl in the office transformed into a confident leader, no longer the team's ugly duckling.
• The once unpopular and unnoticed brand became a global sensation, shedding its identity as the business world's ugly duckling.
• The plain Jane in the group of friends turned out to be the most successful and accomplished, dispelling the myth of the ugly duckling.
• The unimpressive prototype evolved into a groundbreaking invention, proving that it was not the ugly duckling of technology.