Free Windows 7 Shamrocks Theme Pack.
Microsoft uses the Windows Personalization Gallery to not only let customers running the latest iteration of the Windows client customize their desktops with unique imagery, but also enable companies to do brand advertising on the users’ computers. However, the Redmond company is also feeding national pride with a range of themes featuring local content from countries around the world.
The latest addition to the collection of Windows 7 themes is the Shamrocks themepack, offered just in time for the Saint Patrick's Day celebration on March 17th.
Quote - Free Windows 7 Shamrocks Theme Pack - In celebration of Saint Patrick's Day - Softpedia