My friend , indeed I am sorry, I delete the images when I finish the themes.
The wallpaper black if you need, I think if I have it ..... I'll look.
Here you can find to go that she likes.
http://forum.unity-linux.org/sandbox/artwork-unite17!!!/
Some experts in wallpapers could rectify or erase the logo, no?. just idea.
Greetings:
Agust