This icon pack will only replace the LibreOffice toolbar icons with Faenza monochrome icons and will not affect the LibreOffice application icons. Also, you don't have to use Faenza as the system icon theme to use Faenza for LibreOffice!
The beautiful Faenza Icon Theme was updated to version 0.9 today, bringing a new "darkest" theme with status and action icons in light grey.
Here's the complete Faenza Icon Theme 0.9 changelog:
Searching for something totally unrelated, I stumbled upon an amazing theme pack created by Izo called "SHI10 GTK Linux Suite".
An update today brings a darker color for the default icons in Ubuntu 10.04 Lucid Lynx:
The latest ubuntu-mono brings package-supported icons with new logo for software-center, synaptic, new logos to distributor-log as well as a new logo for GDM:
The Gnome icon theme is not exactly a great one or at least I for one never found it to be polished enough to use, but the latest version available via GIT is definitely an improvement.
The Humanity Icon Theme got a really nice update in Ubuntu Lucid today which brings integration with the new branding (purple that is) as well as a new Banshee monochrome icon for the panel.
It was mainly the Metacity theme who has been redesigned, as you can see in the screenshot below:
Almost everyone uses Dropbox these days. If you care about looks, you will probably want to change the icons. Unfortunately, there is no way (that I know of) to change the notification area icon, but the default icons used in Nautilus to display the status of each file can easily be changed. Charles A. @ Dropbox forums posted some beautiful Tango icons
Gstyle is a new full Gnome theme manager with some really great features which I am sure you will love if you like to customize your Desktop look constantly. [...] Gstyle can show you how a theme (any kind of theme: icons, Emerald, Metacity, etc.) actually looks, not just a preview. You will see what I mean in the screenshots below.
The Humanitarian toolbar icons are some great icons you can use with the Humanity theme in Ubuntu Karmic.
It appears the Humanity Panel Icons Pack has been updated, and now you can simply run a script to install all the icons (I wasn't awate of this, thanks rkv!).
Epidermis theme manager is an open source GTK application for managing, automatically downloading and installing themes of various types, in order to transform the look of your Ubuntu desktop, from the moment you turn it on until the moment you turn it off.
Gnome-Art Next Generation is the successor of Gnome-Art and lets you change your Gnome-themes (icon-, wallpaper-, splash-,...-themes) with one click. It is in an early stage and under development but it looks very promising already.