Granted, on the Xperia U it lights up in red, white, yellow, green, purple and blue depending on the music you are listening to or the theme you are wearing, but that's about it.
Up until now, since a third party app emerged called tellingly Illumination Bar Notification, and allows you to set the transparent strip on the Xperia U to light up in all the above colors for new messages, emails, missed calls and so on.
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On the Xperia S and P you only get white color, of course, as that's the only LED stuffed in there, but you can set blinking speeds, and still have a cool notification telling you what's waiting for your attention.
source: IBN (PlayStore)
