Apple’s latest firmware features a new parallax effect that causes your wallpaper to move behind your springboard icons. There’s also a new animation effect that zooms into views as you switch between apps. With iOS 7.0.3 you can disable both effects. Prior versions of iOS 7 can only disable the parallax effect.
Tap Settings from your SpringBoard.
Choose General from the Settings menu.
Select Accessibility from the General menu.
Choose Reduce Motion from the Accessibility menu.
Tap to turn ON the Reduce Motion toggle.
You’ll now notice that your wallpaper stays still and a quick fade effect is used for transitioning between apps.