Blackline is an icon pack. It is not a stand alone application you need a third party launcher to apply it.

A set of icons that stand out on any wallpaper. Use it with any dark wallpaper for better effect.

What's included:

★ 2.700 + HD icons (256x256)
★ Matching HD cloud wallpapers!
★ Launchers support: Action Adw AdwEX Apex Atom Aviate GO NextNova Smart Solo...
★ Icon masking for un-themed icons
★ Dynamic calendar (For Nova Launcher)
★ Alternative icons to choose
★ Updates.