It's the skydome for Simple green line. Obiviusly it's green and black (perehaps to much!). It's 2048 x 1024
To be used with Simple green emerald theme, Simple green settings, Simple green metacity theme and Ubuntu green soul wallpaper.

Screenshot at http://img353.imageshack.us/my.php?image=simplegreen01screenshotnz5.png