Full details:
https://wiki.ubuntu.com/UbuntuStudio/Artwork/UserShowcase
Ubuntustudio 16.04 will be officially released in April 2016. As this will be a Long Term Support version, we are most anxious to offer an excellent customer experience on the desktop. Therefore, the Ubuntustudio community will host a wallpaper
design contest! The contest is open to all Digital Artists and Amateurs,
especially Ubuntustudio enthusiasts. We hope to collect the coolest, most beautiful, inspiring, innovative and downright slick desktop wallpapers. Each artist may submit up to 4 pieces. The Ubuntustudio community will vote on and select 16 final Ubuntustudio Wallpapers! (See what we did there? 16? 4? Clever, eh?)
If you are enjoying Edubuntu, Ubuntu, Ubuntu-Kylin, Ubuntu-Mate, Ubuntu-Gnome, Kubuntu, Lubuntu, Xubuntu or Ubuntu-Server we formally invite and welcome your contributions as well!
If you are interested, take a look at the Ubuntustudio wallpapers over the years: http://flic.kr/s/aHskopgqCF.
Now, GET BUSY! Adapt! Build! Conceptualize! Design! Draft! Draw! Edit! Post-Process! Redesign! Render! Re-purpose! Shoot! CREATE! Show us what you can do with Ubuntustudio's graphic design, video and photography tools!