Recently, Windows 7 build 7057 was leaked on the internet. This release got all new wallpapers and user account photos. As expected, it got all the color and vibe to images. There are over 30 wallpapers and lot of user accounts pics.
To install these user pictures on XP, place them to: [C:\Documents and Settings\All Users\Application Data\Microsoft\User Account Pictures\Default Pictures]. To install these user pictures on Vista, place them to: [C:\ProgramData\Microsoft\User Account Pictures\Default Pictures]. [via]