The contest is scheduled to run until September 12
The developers of Lubuntu 13.10 (Saucy Salamander) are now looking for the perfect combination of wallpapers and the community can vote for its favorites.“Alexander Andjelkovic communicates that the poll for our community wallpaper contest is now up and running at the poll page. Participant wallies are uploaded at our Flickr pool.”
“Vote by choosing 5 wallpapers that you'd like to see in Lubuntu 13.10. The poll will continue until September 12th. So don't hesitate to upload your own creation. You're in time,” reads the official announcement.
Ubuntu 13.10 (Saucy Salamander) already has a definitive list of new wallpapers and all the other flavors are in the process of deciding.
The final version of Ubuntu and Lubuntu, implicitly, are expected to arrive on October 17, 2013, along with the other flavors.