Well this post is for Mac-Lovers.
Transform Your Ubuntu into Mac and Customize it.
1) Go to Ubuntu Software Center and Search for Tweak Tool and install it
3) Tweak tool looks like
4) Run this commands to install Tweak tools using Terminal
sudo add-apt-repository ppa:upubuntu-com/gtk3
sudo apt-get update
sudo apt-get install gnome-tweak-tool
5) Now you can download themes and load them in Ubuntu