You can just use a Windows theme, or launcher. There many on playstore:
https://play.google.com/store/apps/details?id=one.shot.metro
https://play.google.com/store/apps/details?id=com.windows8.go.launcher.theme
https://play.google.com/store/apps/details?id=com.shadowfax.apps.fakewindows8launcher
https://play.google.com/store/apps/details?id=com.jakubd.fakewp8