"If you have had the opportunity of using a recent KDE2 beta,
you may know that KDE2 has supported widget themes for quite a
while now. You may have noticed that these themes are fast.
...thanks mostly to Qt's excellent theming-engine and our optimized
pixmap storage and cache mechanism. ... In addition to native
KDE2 themes, we are pleased to announce that KDE now supports GTK
"In KDE2, icons are themable as well. A nice
application of this feature can be seen if you start KDE2 on an
8-bit color display. In this case, KDE will automatically default
to a carefully crafted icon theme based on a 40-color palette: 216
extra colors are left for the more color-greedy applications. Of
course, on a true color display, you would get the hi-color icon
theme. The size of the icons can also be easily changed. Just
right-click on the toolbar handle, and you'll find a menu with a
selection of various icon sizes. Or change the icon size in other
locations or globally from the KDE Control Center."
"Also notable are the various icon effects. These include levels
of greyscaling, highlighting, colorization, saturation/hue,
semitransparency... and the ability to customize the behavior and
appearance of the icons in all the various states (MouseOver,
default, disabled) and locations (desktop, toolbars, menus, panel).
In fact, if you are creative enough, you can do such things as make
Konqueror look like Netscape. Or Internet Explorer. Or make it look
like something entirely different."