Lion UX Pack will give you OS X Lion UI improvements such as theme and logon screen without touching system files at all so it won't have such risk to harm your system.
You simply have to install Lion UX Pack and your desktop's look will be enhanced in a few minutes. If you want a new look for your desktop, you can try Lion UX Pack.
Here are some key features of "Lion UX Pack":
· Instantly dress up Windows 7 to OS X Lion in one minute
· Seamless installation and uninstallation giving user's confidence and security in system
· Easily configurable in single click with intelligence Metro UI design
· UxStyle memory patching
· OS X Lion themes, wallpapers, user pictures and logon screen
· Start Orb matching OS X Lion themes without actually modifying system files
· OS X Dock emulation with pre-configured docklets optimized for stability/performance
· Expose and Spaces with shortcut keys configured
Users are advised to pay attention while installing this ad-supported application:
· Offers to change the homepage for web browsers installed in the system