This a mix remake of http://www.gnome-look.org/content/show.php/arc-brave-angel?content=95974
and I toke the wallpaper from http://www.gnome-look.org/content/show.php/Homero+Eats+Vista?content=97038
I made this on Ubuntu Intrepid, so the gdm login has the string "Ubuntu 8.10 Intrepid Ibex" at the top of structure, if you want to change it, extract the archive, open with editor the xml file and you can replace the string at the line 39 as you like.
In version 2.0 I used the icons of hydroxygen icon theme to replace the first I used, so I think it has more "sex" appeal! as you can see in the animated screenshot. However the real resolution of gdm wallpaper it's gooder than this preview.
If you have some advises you're welcome!!