In the meantime I used KNS from 
http://techbase.kde.org/Development/Tutorials/Collaboration/HotNewStuff/Introduction
 (with a few little corrections) and made it build and run.
It runs fine, I can see the wallpaper images no problem.
On pressing the close button the app finishes normally without a crash.

For code see here: 
https://bitbucket.org/mkae/kde-tests/src/9b358fdbe20f/HotNewStuff/

and here is some output: 
https://bitbucket.org/mkae/kde-tests/issue/2/hotnewstuff-on-mac-os-x

> An instance of KNewStuff3 is used in Dolphin.
> Settings -> Configure Dolphin... -> Services -> Download New Services...
> The dialog that pops up has a view which uses a delegate derived from
> KWidgetItemDelegate, so if that crashes too then it might give us a
> clue.

OK, but luckily I have Dolphin installed as well and can test your service 
dialog. That test showed that Dolphin was able to open that dialog and even 
downloaded services…

BUT, when I tried to call Dolphin's about dialog I got a crash straight away:
---
QWidget: Must construct a QApplication before a QPaintDevice
QKqueueFileSystemWatcherEngine: error during kevent wait: Bad file descriptor
KCrash: crashing... crashRecursionCounter = 2
---
Here it wasn't even necessary to enter the Authors tab, Dolphin crashed before 
the dialog could be shown. :-(
 
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