Hashbang Productions released FolderBlur a Cydia tweak that blur your iPhone’s home screen wallpaper when you open a folder. The purpose of blur tweak is exactly just to focus on opened folder and to add a little uniqueness to your personal settings on iPhone.
FolderBlur for iPhone is available free for download but first you have to add Hashbang Productions’ beta repository to your Cydia Sources list. So, just tap on Cydia on your iPhone, tap on “Manage” tab, followed by “Sources” section and then tap on “Edit” > “Add” button and type the following URL:
On FolderBlur installation no configurations are required, just install it and go for experience.