A new tweak has been found in Windows 8. There is an a theme called Aero Lite Glass. Aero Lite theme is expected to be the alternative theme for Windows 8 users with low-end hardware. In short, just as you have the Aero Basic theme in Windows 7, you will have the Aero Lite theme in Windows 8.
WinUnleaked.tk has posted this find today, where they have shown how you can enable the Aero Lite Glass theme.
To do so, navigate to your System32 folder and launch WindowsAnytimeUpgradeResults.exe. Thats it. Your Windows 8 will now display the Aero Lite Glass theme.
Windows 8 Aero Lite Tweaker
Our developer Paras Sidhu has also developed a small app Windows 8 Aero Lite Tweaker that will let you quickly enable Aero Lite Glass theme. It works in Windows 8 RTM Final version.
UPDATE: This app was based on a bug or loop-hole of windowsanytimeresults.exe in Windows 8 RTM. But this has been subsequently patched by Microsoft, as a result of which this app will not work now.
We recommend that you backup the original theme before enabling the Aero Lite theme as there currently appears to be no way of reversing the changes.