I actually have been thinking a lot about that, I'm split between 4 ideas.
1. Bend them upward forming a kind of "devil's tail sissy bar / back rest" even if it is strictly ornamental.
2. Chop them off and add a BMX style grab handle
3. Chop them off and plug the ends with red LED lights for taillights
4. Extend them straight into a rear rack
Those are all really good ideas.... the rack would have an x-53 feel to it, bt I think a sissy bar would be the most impressive, in terms of the visual impact...