[Design-team] Attribution question

Hi if we want to use a Spherical Cox wallpaper as the basis for a Spin wallpaper, what is the correct way to attribute the original authors? (file:///usr/share/backgrounds/spherical-cow/default/standard/spherical-cow.png ) Similarly, we may base a desktop KDE theme on a previous one, a KSplash theme using some standard KDE / Fedora icons thanks Brendan