You will need a compatible launcher that supports custom icon packs. Compatible with Go Launcher, Apex Launcher, Nova Launcher, ADW Launcher, Holo Launcher, Action Launcher, Smart Launcher and more. Note that this is not a standalone app. Apply icon pack from launcher’s settings after install. For other launchers, get Desktop Visualizer to apply icons on the homescreen: https://play.google.com/store/apps/details?id=jp.co.bii.android.app.dskvzr
More details below:
Features: 650+ icons and counting. Custom icons such as Space Invaders and more. Optimized for 1080p display. Go to http://minimalpixel.tumblr.com for more details!
To apply custom icons: Apex Launcher and Nova Launcher Prime: Place shortcut on homescreen > Long press on shortcut and select Edit > Press on the app icon > Select (from) Icon Pack > Select Minimal Pixel > Choose the icon you want to apply.
Desktop Visualizer: at the DVR setup screen > Press Select Icon > Select Others > Select Minimal Pixel > Choose the icon. (Custom icons are located at the end of the list)