cd /home/{UserName}
ll -a

//You should see .PhpStorm* Directory (For e.g, .PhpStorm2016.2)

cd .PhpStorm2016.2/config/colors

//Go to the https://github.com/daylerees/colour-schemes/tree/master/jetbrains
//Choose Font
//Copy link: for e.g. https://raw.githubusercontent.com/daylerees/colour-schemes/master/jetbrains/earthsong.icls

wget https://raw.githubusercontent.com/daylerees/colour-schemes/master/jetbrains/earthsong.icls

Restart the PhpStorm and you should see the theme