A simple yet elegant Login screen.
Widescreen version. 1400x900
The ubuntu logo has been taken from the default Human ubuntu theme.
Follow these instructions if you want to remove it.
1.Extract the tar.gz file.
2.Open theme.xml with any text editor.
3.Delete the four lines of code below "ubuntu logo". (You may add another logo if you want by simply replacing "ubuntu.png" with the name of your file. And copy that file into the folder.)
4.Save the file.
5.Now copy the folder to /usr/share/gdm/themes.