Microsoft has launched a new Themes department within the Microsoft Store on Windows, allowing users to easily discover and customize their devices with curated themes. The store now features over 400 themes, including more than 35 new additions, such as the Sea of Thieves theme and the World National Parks theme. Users can manage their themes through Windows Settings, and the store also offers various apps for further customization. Microsoft encourages user feedback and contributions through the Feedback Hub and the Theme Publisher Interest Form.