Themes made specially for the recently released Ubuntu 14.04 Lts are thin on the ground it seems, and not all themes for previous releases of Ubuntu will work as well as they were intended to. But, as people start to update and create new ones we’ll start to see some beautiful themes available.
I’ve scoured the internet over the past few days and have collected some themes, that in my opinion, are the loveliest/coolest/neatest themes available right now for Ubuntu 14.04. Most of these themes will be installed through ppa and you can enable them using the Unity Tweak Tool (a must install for all Ubuntu users). Install the tweak tool by entering the following command into the Terminal:
sudo apt-get install unity-tweak-tool
Numix Theme and Icon Pack
Use these commands to install Numix theme and icons on Ubuntu 14.04 Trusty Tahr
sudo add-apt-repositoryppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-gtk-theme numix-icon-theme-circle
sudo apt-get install numix-wallpaper-notd
Orchis GTK Theme
Use these commands to install Orchis GTK Theme on Ubuntu 14.04 Trusty Tahr
sudo add-apt-repositoryppa:moka/orchis-gtk-theme
sudo apt-get update
sudo apt-get install orchis-gtk-theme
Ambiance Crunchy themes
Use these commands to install the Ambiance Crunchy themes in Ubuntu 14.04.
sudo add-apt-repositoryppa:noobslab/themes
sudo apt-get update
sudo apt-get install ambiance-crunchy
Trevilla Flat GTK Themes
Use these commands to install the Ambience Crunchy Theme Pack:
sudo add-apt-repositoryppa:noobslab/themes
sudo add-apt-repository ppa:noobslab/icons
sudo apt-get update
sudo apt-get install trevilla-themes
sudo apt-get install trevilla-icons
Zukitwo and Zukiwi Theme
Use these commands to install Zukitwo and the Zukiwi Theme
sudo add-apt-repositoryppa:noobslab/themes
sudo apt-get update
sudo apt-get install zukitwo
For Zukiwi:
sudo add-apt-repositoryppa:noobslab/themes
sudo apt-get update
sudo apt-get install zukiwi
Zorba Theme Collection
This collection of themes is available through the links below, once you have downloaded the themes, create a Folder names “.themes” in your home folder and extract all the themes to that folder. Then enable them through the normal Unity Tweak method. 1-http://gnome-look.org/content/show.php/Glory?content=164707&PHPSESSID=aad2c70f4c2b5af9890e229ab6251c15 2-http://gnome-look.org/content/show.php/Sensation?content=164713&PHPSESSID=aad2c70f4c2b5af9890e229ab6251c15 3-http://gnome-look.org/content/show.php/Ocean?content=164719&PHPSESSID=aad2c70f4c2b5af9890e229ab6251c15 4-http://gnome-look.org/content/show.php/Love+%28Trusty+Tahr%29?content=164721&PHPSESSID=aad2c70f4c2b5af9890e229ab6251c15 5-http://gnome-look.org/content/show.php/Wonderland+%28Trusty+Tahr%29?content=164720&PHPSESSID=aad2c70f4c2b5af9890e229ab6251c15