This is the old default theme of E17, the smooth and elegant Black & White theme with a new shiny feature!
Go to Settings -> All -> Look -> Color and change the "Focus Change" entry to replace all the black with your favorite color: click on the preview to see all the color changes!
Please, tell me if I have missed some black and uncolored part.
Enjoy this theme and E17!
Changelog 8 may 2013:
Fixed icon_dummy.png missed. Thanks to radradder for the notice.
Changelog 4 feb 2013:
Fixed the horizontal scrollbar
Fixed the Color Slider issue on Settings -> Color: Now you can click on color bar on the "Select Color" window to match more precisely your favorite color!