YOU NEED A CM12 OR CM12 BASED ROM WITH THE NEW THEME ENGINE. IF YOU DON'T KNOW WHAT WHAT CM12 IS DON'T DOWNLOAD...

Sonic is pure flat in design, tried to give very elegant look with flat black and flat white color. Keep updating and keep rating with 5 stars....

This is biggest icon pack out here on playstore with more than 3500 white-minimal icons....