I prefer to make LibreOffice behave as a GTK+ application in KDE4. Somehow, it looks and feels better this way. To do this, I simply added the following line in
/usr/bin/libreoffice (in the beginning, before the rest of the variables):
# Use GNOME UI export OOO_FORCE_DESKTOP=gnome # use POSIX locale for well-defined tool output LO_SAVE_LC_ALL=$LC_ALL LC_ALL=C export LC_ALL
Now, it will inherit the oxygen-gtk theme, which makes all menu colours as they should be. Also, the program defaults to the GTK+ open file dialogues.