Fedora Magazine - https://fedoramagazine.org/fedora-28-supplemental-wallpaper/
Each release, the Fedora Design team works with the community on a set of 16 additional wallpapers. Users can install and use these to supplement the standard wallpaper. Submissions are now open for the Fedora 28 Supplemental Wallpapers, and will remain open until February 13, 2018.
You always wanted to start contributing to Fedora but don’t know how? Contributing a supplemental wallpaper is one of the easiest way to start as a Fedora Contributor.
What exactly are the supplemental wallpapers?
Supplemental wallpapers are the non-default wallpapers provided with Fedora. Each release, the Fedora Design team works with the community on