Some People don't like white dots in Ubuntu 12.04 Login screen, So here is a tweak you can easily remove these dots from login screen.
To Remove White Dots from Ubuntu 12.04 login Screen open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
Here are more tweaks for Ubuntu 12.04 Precise Pangolin.
Important Tweaks and Some more Tweaks.
That's it, Enjoy