In my opinion, the second-ugliest feature of the TBA, after the rear peg holders, are the rear turn signals. Here's my solution.

The license plate frame incorporates a row of EXTREMELY bright red led's. They are always on, functioning as additional running lights.
When you touch either brake, the center portion pulsates rapidly for a few seconds, then stay brightly lit.
The left and right segments are turn signals, flashing sequentially, very bright.
I'm leaving the giant fron signals as is, for fear of the left-turn lulus out there, but this seems to be a very elegant solution for the rear.
Installation note: It was a fairly complicated installation, requiring spldering. Not plug-and-play. It also required installation of a load equalizer, without which the signals would have flashed very rapidly, as if one were out.

Here's the manufaturer URL: http://www.kisantech.com/index.php?cat_id=1

And how it looks on the bike. Note that I installed it so the led's were on top.