Source (link to git-repo or to original if based on someone elses unmodified work): https://git.opendesktop.org/zinjanthr0pus/qplatinum
This is a quick and dirty copy of the Apple Platinum window decorations using the emerald pixmap engine. I have also created a script to recolor this theme that I will upload separately. Note that it doesn't work too well with kwin's smaragd plugin because of a bug: https://bugs.kde.org/show_bug.cgi?id=381947
Hope you enjoy it!