There are several layers at which a GNU/Linux system's appearance can be customized. By far the most visible, especially on a multi-user machine, is the login manager screen. KDM (the KDE desktop manager) has a highly-flexible and easy-to-use XML-based theme system. If you can draw what you want, you can make it happen with a KDM theme. I’ll talk you through the construction of one simple theme I designed for my ASUS Eee PC.
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