Ubuntu is a linux based community driven free operating system. Hence, it is all about the community and user contribution. As the default set of wallpapers, Ubuntu would like to include a beautiful set of images for the users to choose from in the next release, Karmic. In order to accomplish this they have set up a wiki page to explain things and guidelines for inclusion. In addition they have started a flickr group to attract current flickr users and encourage new contributors to step up and take the plunge. If you have amazing photos which you would like to share with the world, please add them to the list!
Why not include some breathtaking photos of Maldives in Ubuntu?
* Wiki page: http://wiki.ubuntu.com/Artwork/Incoming/Karmic/Backgrounds
* Guidelines: http://wiki.ubuntu.com/Artwork/Documentation/Backgrounds
* flickr group: http://www.flickr.com/groups/ubuntu-artwork