I've asked upstream about it, and Nautilus' lead developer has already replied:
http://mail.gnome.org/archives/nautilus-list/2011-April/msg00006.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/743962 Title: ooo-thumbnailer should use icons from the current icon theme -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs