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

What's included:

? 4.887HD icons (256x256)
? 115 HD cloud wallpapers
? Launchers support: Action Adw AdwEX Apex Atom Aviate GO NextNova Smart Solo
? Icon masking for un-themed icons
? Dynamic calendar
? Alternative icons to choose