Developed and delivered the Darcula Forest Theme extension for the zed-industries/extensions repository, focusing on enhancing user interface customization and broadening theming options. The work centered on UI/UX design and front end development, leveraging TOML to define theme parameters and ensure compatibility with the existing theming API. By introducing a distinctive Darcula Forest aesthetic, the extension enabled users to personalize their environment and align with branding preferences. The implementation was structured for maintainability, with clear documentation and a single, traceable commit. This contribution laid groundwork for future theme additions and streamlined the process for ongoing UI customization within the repository.