Grey Windows 8.1 Theme also works on Windows 8.
You can use it with any of this icon packs Windows 8 Icon Packs.
“Corp” is minimalistic by design and plays with colours to achieve ‘transparencies’ both in the window borders and the taskbar.
If you wish to get rid of the ribbon use the provided tool Ribbon Disabler for Windows 8, and to use free Startmenu use this app “Classic Shell” Free Customizable Start Menu.
Visit this link to know How To Setup Windows 8 Visual Style.