Currently the suggestions for Artwork for the desktop are:

Desktop Wallpapers
OpTunisia (HDR of both pics; version info)
http://www.lupiupload.de/file.php/file//r/seriousredditv97uCDOV6U

Free flight
http://www.lupiupload.de/file.php/file/26Q7EbsGzP

Nightclub flowchart
http://www.lupiuplo/r/seriousredditad.de/file.php/file/tBAuIV9xHB 

Waterfall [3D; (Anaglyph)]
http://www.lupiupload.de/file.php/file/d5OW0EFF_R

Forest-Sky [3D; (Anaglyph)]
http://www.lupiupload.de/file.php/file/IxsP8FjhUu

Aquarium [3D; (Anaglyph)]
http://www.lupiupload.de/file.php/file/Vg8qe8MDfV

Lolcat(s)
http://www.lupiupload.de/file.php/file/jgm2unOBIx
http://www.lupiupload.de/file.php/file/f_GmHX_w9u

Anonymous Blueprint
http://fc06.deviantart.net/fs24/f/2008/028/8/3/Anonymous_Blueprint_Wallpaper_by_coollettuce.jpg

Anonymous - Flag with coat of arms
http://flangenimblick.files.wordpress.c/r/seriousredditom/2009/06/anonymous_wallpaper_2_by_xyzer.jpg

Scratchlook Graffiti (Black & White)
http://fc01.deviantart.net/fs48/f/2009/215/5/c/Anonymous_Wallpaper_by_ipott.png

cruelness
http://images2.fanpop.com/image/photos/10600000/Anon-anonymous-10657686-1280-960.jpg

You May call me Anonymous
http://ipadwallpaper.eu/wallpapers/2/anonymous.jpg

Fawkesmask 
http://images.alphacoders.com/667/1024-768-66787.jpg

We do because we can
 http://images2.alphacoders.com/551/55151.jpg
 http://wall.alphacoders.com/images/950/95006.jpg

Rainbow 
http://images.alphacoders.com/720/1024-768-72007.jpg

Expect us!
http://flangenimblick.files.wordpress.com/2009/06/anonymous_wallpaper_1680x1050_by_johncox88.jpg

Anonymous Floor
http://www.wallpapervoid.com/wallpapers/misc/anonymous/-Anonymous-1859.jpg

Happy Security 
http://www.happy-security.de/images/wallpaper/HS-Wallpaper4.jpg

Longcats
http://shimmie.shishnet.org/v2/_images/7637396405225e564b3c5105c7de44fd/1061%20-%20longcat%20wallpaper.jpg

Be Anon
http://images2.alphacoders.com/555/55558.jpg

Matrix 
http://www.scenicreflections.com/files/Anonymous_Matrix_Wallpaper_df9ln.jpg

Awesome Legion
http://images2.fanpop.com/image/photos/10000000/fff-anonymous-10071137-1440-900.jpg

Anonymous logo + paint splatters
http://canitbesaturdaynow.com/images/fpics/654/April_-(4).jpg

Anonymous Cherubium
http://jootix.com/upload/DesktopWallpapers/cache/Anonymous-anonymous-1280x800.jpg

They shall be packed as Folders for one Theme, so that all fits!

 * [themename].theme (folder)
 * Desktop.png (Desktop Wallpaper)
 * themesetup.kde (folder)
 * (all configuration-files needed for the theming!)

A firefox skin would be hot.