After selecting and landing the default wallpaper stack for Ubuntu 12.10, the developers have just published and landed in Quantal the default wallpaper.
The new default wallpaper definitely takes a different approach in terms of expressing the visual brand of Quantal Quetzal, combining warm colors with shadows, similar to a wave of colors.
The eye is to follow a solid yet fluid movement from the right-side to the left area of the screen, a movement of light encompassing the shiny Quantal desktop.
The wallpaper is available for download on launchpad 
linuxblog1 