Yeah... Install Xposed framework and download rainbow bars or GEM XPERIA exposed or Serajr Xperia exposed etc...
It is pretty easy...
http://xdaforums.com/xposed/framework-xposed-rom-modding-modifying-t1574401
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Hey Guys
I was just wondering if we could change the colors of these buttons? can anyone help me with that? maybe post me a thread url or something because I've searched a lot and I've found nothing at all. ThnQ