Come on man, please use the search bar on xda or even use google, this question has been asked like thirty times in this forum alone. But to answer your question, go to this link: http://forum.xda-developers.com/show....php?t=2697369
Follow the thread instructions and then flash the runtimeskin.zip provided in the thread. Flash Gordon will do the job. To get the full theme experience, after flashing runtimeskin.zip, navigate to /system/vendor/overlay and delete every file there and then reboot. And another useful tip is to enable superuser mod for the serajr xperia xposed module. This will allow you to install themes as a normal apk. That's all.
But bro please remember, the next time you wanna post anything, search it up before asking, thank you.
Press Thanks If I Helped!!