Install Elementary-OS http://linuxg.net/how-to-install-elementary-oss-pantheon-desktop-environment-on-ubuntu-and-linux-mint/

install-elementary.sh

sudo add-apt-repository -y ppa:elementary-os/stable
sudo apt-get update
sudo apt-get install elementary-desktop

# To get over the wallpaper bug, open a terminal and paste the below oneliner:
gsettings set org.gnome.settings-daemon.plugins.background active true

# Also, if you want a closer look to Elementary OS, you should install plank, from ricotz PPA:
sudo add-apt-repository ppa:ricotz/docky
sudo apt-get update
sudo apt-get install plank

# Next, install the Elementary Tweaks tool in order to tweak your system:
sudo add-apt-repository ppa:versable/elementary-update
sudo apt-get update
sudo apt-get install elementary-tweaks