http://www.geoid.clara.net/rik/widget_style_tutorial.html

Tutorial on writing your own KDE widget style from scratch.

Includes a full working example and an easy-to-use empty
framework you can use to start from.

This tutorial should be part of the dot tutorial series,
but dot is down right now and there's not long until
the IBM competition closes, so you can have it now.

The tutorial text isn't very large, mostly because it
doesn't need to be. If you have written Qt code before,
you won't find writing a style difficult. There are
plenty of tips there, though, to help you on your way.

The example style and the skeleton should be the most
helpful bits.

Rik