First: Add repository of the distribution and do the update :
sudo apt-add-repository ppa: versable / elementary-update
sudo apt-get update
Second, install the required tools :
1- Elementary Tweaks
Helps you to customize your system , install It by running the following command :sudo apt-get install elementary-tweaks
2- additional backgrounds
sudo apt-get install elementary-wallpaper-collection3- Add indicator-synapse for a quick search for applications and tools
sudo apt-get install indicator-synapse4- Bridi program for Twitter accessing
sudo apt-get install birdie-granite5- gazette
Beautiful tool to follow the latest news via RSS and weather conditionssudo apt-get install gazette
6- Additional features
sudo apt-get install elementary-plank-themes elementary-plank-extra elementary-wallpaper-collection elementary-elfaenza-icons elementary-blue-theme elementary-champagne-theme elementary-colors-theme elementary-harvey-theme elementary-lion-theme elementary-milk-theme elementary-plastico-theme elementary-whit-e-theme7- WingPanel-Slim
sudo apt-get install wingpanel-slimNote: Note that some of the above programs are not as a standalone program but they are presented in any system settings with a built-in and integration .