Copy the XML color scheme file in one of this folders depending on your version of IntelliJ
Mac OS X
~/Library/Preferences/IntelliJIdea12/colors (IntelliJ IDEA 12 Ultimate Edition)
~/Library/Preferences/IdeaIC12/colors (IntelliJ IDEA 12 Community Edition),
~/Library/Preferences/WebIDE50/colors (PHPStorm 5.0).
Windows
Documents and Settings/<user>/.IdeaIC12/config/colors (IntelliJ IDEA 12 Community Edition)