If you want to use OpenOffice on Mac OS X you have to install a X server and a appropriate windowmanager. For OpenOffice XDarwin and OroborOSX are redcommended.
After installing OroborOSX and starting it it showed up with 'Can't find themes'.
The 'OroborOSX' folder under 'username/preferences/' was owned by 'root'.
I deleted the whole folder and started OroborOSX again. That's it. The folder and files are now owned by the appropriate user and OroborOSX started without trouble.