As we all know Windows 7 is under beta testing at the moment and the latest official Windows 7 Beta build is 6936. This latest beta build contains a new desktop wallpaper. This wallpaper is quite similar to the previous one included in beta build which was shown at PDC 2008 event.
Following is a preview of this new wallpaper which features "betta" fish:
You can download this wallpaper using following link: