I though my first theme wasn't finish and so I made a new one - which I say it is better version of the first.
Don't think I am stuck with this idea, I just want to perfect it and when I will be pleased I will make other cool GDM themes.
So, what did I do in this new theme?
I changed a little the buttons, added a cool gradient, changed the color of the text "Username:".
I hope you like this theme more.