Microsoft has popularized the metro interface design with their mobile smartphone OS and the new release of Windows 8. Web designers have also picked up this trend in various layout elements such as headers, buttons, backgrounds, and hyperlinks.
This gallery includes a number of free metro flat PSD user interface kits. You can download and play with anything that catches your attention to create mockups of mobile apps or websites. Some kits are more focused on flat elements while others follow the metro design trend. But all of these kits should provide value to designers looking for new ideas in their work.