All this is is the image (xpm) file used for the grub splash screen, nothing more. Use if you wish, or not.
Wallpaper version can be found here: http://kde-look.org/content/show.php/Moon+1400+x+1050?content=89692
Go to System > Administration > Startup-Manager
Click on the Appearance tab
Under Bootloader themes check the box by "Use background image..."
click "Manage bootloader themes..." button
select the file
select moon from the drop down beside where it says "Grub background image"
hit close and you're done
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