now you can use any background using this little app [link] -Updated with x64 files ,thanks to ~pierdelp
this is an alternative background for windows 8 developer build
the green one was horrible ...
-how to install : 1-run "takeownership.reg" 2-go to windows/system32 and take ownership of shsxs.dll and uxtheme.dll 3-rename them "shsxs.dll.bak" and uxtheme.dll.bak 4-extract the ones included in the archive 5-reboot ,and you are done
note that it also changes the logon screen color ,and some other parts