Windows 7 Build 7057 seems to be actual Release candidate and it has many new changes like new wallpapers set, new logon and shutdown screen and many bug fixes. If you have seen screenshots of Windows 7 Build 7057 then you will notice Windows 7 Build 7057 wallpapers are stunning and awesome.
Also Windows 7 build 7057 has several new User account pictures. As usual deviantart users have again managed to extract wallpapers and user account pictures from windows 7 build 7057, and are available for download.
Windows 7 Build 7057 Wallpapers
30 New Wallpapers
Windows 7 Build 7057 User Account Pictures
Total 36 new user pictures!
Download Windows 7 Build 7057 User Account Pictures for XP and Vista(1.3 MB)
How to Install Windows 7 Build 7057 User Account Pictures
To install them on XP, place them to: C:\Documents and Settings\All Users\Application Data\Microsoft\User Account Pictures\Default Pictures
To install them on vista, place them to: C:\ProgramData\Microsoft\User Account Pictures\Default Pictures