Add Elementary Tweaks to customize the desktop

Elementary OS has Elementary Tweaks that enables you to customize desktop. You can change themes, tweak animation etc with it. Elementary Tweaks is available in a community PPA by Elementary OS team:

sudo apt-add-repository ppa:versable/elementary-update
sudo apt-get update
sudo apt-get install elementary-tweaks

With elementary Tweaks, you can change themes, configure advanced Plank 
options, tweak animation timings, configure Files and Slingshot. And the
best of all? It is written as a plug and therefor integrates into 
switchboard!

In case of error message: to solve this problem with libgranite2 you have to add this ppa:
sudo add-apt-repository ppa:elementary-os/daily
sudo apt-get update

Install with: sudo apt-get install libgranite2
Install elementary tweaks with: sudo apt-get install elementary-tweaks