Microsoft has released Ireland themepack for Windows 7 and it is now available for download. Do note that Windows 7 themes can only be used in Windows 7 Home Premium, Professional, Enterprise, or Ultimate editions.
Green landscapes, gorgeous seaside cliffs, and mysterious rock formations—it must be Ireland. Download images of the Emerald Isle, as well as Celtic sounds, in this free Windows 7 theme.
The theme pack contains 17 scenic wallpapers.
Download page: Microsoft. (Theme taken down)
You can also extract the wallpapers of any themepack and use them separately. Go here to learn how to make a Windows 7 themepack.