Here's the New Desktop background that the Epic Games Community site gave out.. I was like that is sexy... So I added the Gears logo and made it my Computers desktop and my XBL Dashboard background. Now you can have them too..
Here is what it looks like on my dashboard.
Here it is for you
Here's a few COG Backgrounds that I made (Made a few changes to the first one
If you don't know how to use just use a USB Flash Drive or a External Hdd or even Network sharing will work to.
If your using a USB Flash Drive or a External Drive just load the picture onto your Drive then connect to Xbox and select "Picture Library" then highlight picture and push (Y) button to apply to your background and there it is.
If you use network sharing same thing just put picture in your photo sharing location then fire up the Xbox and select "Picture Library" then highlight picture and push (Y) button to apply to your background..
Ohhh you can get the original here from the Epic Community Site