After a brief flirtation with pock marks, Apple embraced into the linen texture in a serious way with iOS 4, making it the background for both the multitasking fast app switcher dock, and for the open view of folders. Both of these UI metaphors were supposed to be "behind the scenes", with the iOS screen literally opening up to reveal them. With that was meant to convey the padding beneath the armor or the t-shirt beneath the jacket, who's to say? In the iOS 5 betas, however, Apple has gone all in on linen. While iOS 4 kept linen subtle and dark, iOS 5 brings lighter shades as well. You can find it as the background to the welcome screens when you update or re-install the OS. You can find it behind the new Notification Center when you swipe down from the title bar. Also, for the first time you can find it in OS X as well, in beta for Lion.