The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Logan Lane:
Wallpaper FX gives you control of your wallpapers and backgrounds!Wish that wallpaper was a different color? Colorize it. Want to create your own blur wallpapers? Do it.With Wallpaper FX you can totally customize the look of you home screen and lock screen wallpapers and backgrounds. You will love what you create with it!Wallpaper FX is made exclusively for iOS 7! Send images from other apps to Wallpaper FX or load from the camera roll Color your wallpaper or background Blur your wallpaper or background Undo changes you don't like Home screen preview before you save Save your masterpiece to the camera roll Transform your lock screen or home screen