From Fedora Project Wiki
Default Theme Artwork Submissions
Release name for F16 has been selected: it's Verne.
We have a special page for the submissions for general wallpaper.
Submit your wallpaper concepts here!
Supplemental Wallpaper Submissions
We have a special wiki page just for uploading your supplemental wallpapers:
Submit your supplemental wallpapers here!
Release Banners Submissions
We have a special page for the submissions for release banners.
Submit your release banners concepts here!
Splashes Submissions
Anaconda
Firstboot
GRUB
Syslinux
Other Release Graphics Submissions
Release Poster
We have a special page for the submissions for release poster.
Submit your release poster concepts here!