Home Screen Background Help

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http://forums.androidcentral.com – I tried out the Atom launcher on my S4 but I didn't get on with it. I have been using the default blue background since I had the phone but Atom changed it to it's own wallpaper. I cannot find how to get the blue back. I have managed to put one of the two wallpapers that came with the phone on but I prefered the blue as it made the icons clearer. I have tried resetting the defaults on touch wiz and I have cleared the data and cache but it is still the same. Any help would be appreciated. (HowTos)