The most beautiful part of being a linux user is the choice you have, whatever issue it is. Like any other Linux distro, Ubuntu is infinitely customisable with any number of themes and applications. This include login window themes or gdm themes as well. Major source for themes in ubuntu include www.gnome-look.org and www.deviantart.com. There, you could obtain literally thousands of good quality themes.
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Eventhough there is a number of good quality themes available for Ubuntu through various sites like gnome-look or deviantart, it is still a difficult job to find full set themes which include gdm themes(login window theme), wallapaper, metacity themes, icon set etc. But there is an option to download it from PPA launchpad repo itself, which is always the safer bet. Special thanks to the Zgegblog guys for contributing these out of the world themes for Ubuntu users.
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