Is there an iOS GUI skin/theme for Android? Is there an iOS-like skin for Android and/or a launcher with an iOS theme?
Espier Launcher is a homescreen replacement that mimics iOS quite well, and still allows for some of Android's features to shine through (Widgets, customization, etc).

Unfortunately, it's apparently built by a small Chinese dev shop, so it does have a few quirks. For one, it intalls some bloatware app store that's all in Chinese, although it's easy enough to hide it from the launcher. There's also some weird mis-translations in the app's settings. Despite these shortcomings, it's a faithful reproduction of iOS's homescreen, and the folder/scrolling/long press animations are spot-on.