Hello Linux Geeksters. As you may know, new flat icons for LibreOffice have been released.

The new icons are based on Gnome’s symbolic icons. The new icons are not ready finished, but they can still try them on your Linux Box.
This is how to install the new icons on Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Linux Mint 15 Olivia, Linux Mint 14 Nadia and Linux Mint 13 Maya.
Instructions for installing the new Flat Icons on the newest LibreOffice versions:
First, install libreoffice-style-crystal:
This command installs the LibreOffice Crystal icons and the next command will replace them with the new flat icons:
$ sudo apt-get install libreoffice-style-crystal
Download and add the new flat icons:
$ sudo su
# cd /usr/share/libreoffice/share/config
# wget https://github.com/hotice/myfiles/raw/master/images_flat.zip -O images_cristal.zip
Instructions for installing the new Flat Icons on LibreOffice 4.* versions:
$ sudo apt-get install libreoffice-style-crystal
$ sudo su
# cd opt/libreoffice4.0/share/config/
# wget https://github.com/hotice/myfiles/raw/master/images_flat.zip -O images_crystal.zip
To activate the new icons, on your LibreOffice, go to Tools -> Options and under the LibreOffice menu -> View -> Icon size and style and set the Crystal icon theme.
Like in the screenshot above: (from webupd8)