deKorator is a native themable window decoration engine for KDE 3, written by Moty Rahamim. You can find a KDE 4 port on kde-look.org. The port is also available in KDE’s subversion repository, in playground/artwork. The KDE 4 port is now free of Qt 3 and KDE 3 support dependency. Please test it and report bugs and suggestions.
Improved window themes with deKorator 0.5 « Keeping Computing Personal said
[...] I ported it to KDE 4, I did not try to improve it in any way; my first goal was to have it available at all. The only [...]