That "under Vista" for the old faithful Windows XP was enough. Anyone who was not satisfied with the classic interface could easily install any Vista-pack and transform the UI of the native windows without much damage to the computer's performance.
Understandably, even prettier than in Vista, Windows 7 interface also interested many. And here's the first (like) upgrade of Windows XP to the Windows 7 interface called NiwradSoft Seven Remix XP.
The only pity is that this is only a visual upgrade. That is, it does not introduce any new functionality. However, you can add new functionality, for example, with such things as shortcut utilities from Windows 7 and introducing changes to the Aero Shake interface, Aero Snap and Aero Peek .