Windows 7 offers a new personalization option for fans of the most lovable green ogre that made it to the big screen. Microsoft is offering a new Shrek theme, based on the fourth installment of the franchise, available as a free download for users of the latest iteration of Windows. The “Shrek Forever After” is served through the Windows Personalization Gallery, and is bound to be a collaboration between the Redmond company and Dreamworks, although neither of the two announced anything officially.