I like the HumanOlive theme, so I did this gdm to match with him. It includes the gnome logo, browse faces and round edges.
The tar.gz includes the .xcf file (gimp), you use it as template.
Based on GDM Theme Serenity w/Faces 0.4, by Seth Hasani, backround image by Franziska Frannerts, from Avio GDM theme, icons from gnome-look.org.
Note: The screenshot is not updated to final work. The final work is better.