To express your appreciation to your coworkers for their contributions, consider gifting them something thoughtful and meaningful. For example, a personal note or card expressing gratitude for their hard work, or a small token of appreciation like a coffee mug, a book, or a handwritten letter. You could also consider organizing a group activity or outing that everyone can enjoy together, such as a holiday lunch or a team-building exercise. The most important thing is to show your coworkers that you recognize and value their contributions to the team.