How to offer wallpapers for next Ubuntu release?

Hi there,

I've a few photos that most viewers would wish to use as wallpapers. I don't want to make money with it, but it makes me very happy when someone likes what I'm doing and decides to place it somewhere where it is constantly seen. And obviously it would make me very proud if one of my photos would get into the next Ubuntu release. Even though I could imagine that you guys get bombared with wallpapers I'd like to know how wallpapers get selected for Ubuntu releases?! Here what friends and collegues around me use as wallpapers:

https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5735193465950298562?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5604275206084689410?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5602353931172855090?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5602355366362284210?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5760549097838787154?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5735193700419062274?partnerid=gplp0
https://plus.google.com/photos/114159599523222947515/albums/5602353750011191169/5735193624412438114?partnerid=gplp0

Thanks,
Stephan