Simple theme that seamlessly blends in with the default kubuntu 12.04 boot splash. By also selecting the "Kubuntu" KDE splash screen in the System Settings, one can thus achieve a completely seamless appearance from kubuntu boot splash, to kdm menu, to KDE splash screen. (The "Kubuntu" KDE splash screen is part of a default kubuntu 12.04 install; however, it is not selected by default.)
This theme is a modification of the similar 'Kubuntu Sitter' by Chris Robinson.
The difference is that it uses a textbox to input the user name rather than displaying the list. I consider this to be a little bit safer, as it does not reveal the possible user names. It also makes the look a little bit cleaner.
It is also using two separate buttons to choose the session and other options.