You can download Box icons and Box theme at the Artwork section. The current version is 0.42+bzr384, which means you should our PPA to keep it uptodate, because I'm planning to improve it a lot more.
The only negative part is that Unity-Tweak-tool or Gnome-Tweak-Tool "don't see" the theme, you need to use Ubuntu-Tweak. Instructions on a terminal for everythng:
sudo add-apt-repository -y ppa:lubuntu-art/daily
sudo add-apt-repository -y ppa:tualatrix/ppa
sudo apt-get update && sudo apt-get install -y ubuntu-tweak lubuntu-artwork
And that's all for this moment. Feedback apreciated.