Whited00r allows your legacy devices to experience similar features as iOS 7 while offering better performance on iOS 3.1.3. While not perfect, it does really offer much greater performance than stock OS while delivering more. All icons and animations attempt to match iOS 7 as well as the app switcher and control center.
Control Center is probably the most perfected part about Whited00r 7. It works perfectly, except for do not disturb. Wallpaper, app UI, and the switcher all look great. Other than GUI changes, control center, folders, wallpapers, and the fact that it’s jailbroken, it behaves like you would expect iOS 3.1.3 to.
Link: Whited00r 7