NOTE: This method only works in Windows 8 Developer Preview build.
Recently we told you how to customize Windows 8 Developer Preview Start Screen green background and other Metro UI stuff in following tutorial:
Now if you don't want to modify the system files manually but want to get rid of the green background, here is excellent news for you.
Our friend "thepanda-x" @ DA has modified the required file and uploaded it so that everyone can download and use in their Windows 8 system. This file will change the green background to purple, black or blue.
Following are previews of Purple, black and blue versions in action:

HOW TO USE:
1. First download the required file using following link:
2. Now extract the ZIP file using WinZip, WinRAR or 7-Zip and run "Takeownership.bat" file.
3. Now go to "C:\Windows\System32" folder and rename "shsxs.dll" to "shsxs.dll.old" and "uxtheme.dll" to "uxtheme.dll.old".
PS: If you face problem while renaming the files, you can try to take ownership again using any of following tutorials:
- Add Take Ownership Option in File / Folder Context Menu in Windows XP, Vista and 7
- [Guide] How to Take Ownership (Permission) of a File or Folder Manually in Windows?
4. Now copy new shsxs.dll and uxtheme.dll files (which you got from the extracted ZIP file using Step 2) to "C:\Windows\System32" folder.
5. That's it. Restart your Windows and now you'll enjoy the new purple background in Windows 8 Start Screen.
NOTE: To restore default green background, simply run "Uninstall.bat" file present in downloaded ZIP file.
This article was posted by VG in following section: Windows 8.
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metrouilover
it says it cant unzip with 7zip not surrported
metrouilover
it says with winrar its corrupted
VG
^^ He just updated his file and it seems that the new updated file is corrupted. The previous file which I tested at the time of writing this article was fine. We'll need to wait until he uploaded a working file.
metrouilover
ok thanks may i ask what is the change in the uxtheme what does this version do
VG
^^ Now the ZIP file has been fixed. Please re-download.
metrouilover
i did. it works. not what i really want but much better then green lol
metrouilover
flickr.com/photos/67734367@N08/6160596948/ i rather have this if you guys find anyway to pull it off that be great
metrouilover
i have made some really cool new background for metro ui all the same size as the old ones
Hackerpunk1
Can someone here send me the 2 dll files of 32bit
tabreborn
Awesome! Can I download the background? XD