The final release of Windows 7 which debuted on 22 October has more International themes for you to choose from. Not that these are installed by default, you have to go and fetch them manually. As of now 20 countries have been put on the list but there are more to come.
Head over to the Windows 7 personalize portal and scroll down till you see the International themes section. From here you can choose the country you stay in and download the theme. Most themes are over 2MB download. You can hit the download links from here too. (More Windows 7 Tips and Articles)