I put some bright red LED's to good use.
I installed them on the back of the segway. No need to buy segway's tail light now, especially as I think mine are brighter.. There's 4 leds on each side, in a 2x2 configuration. All 8 tail light leds only added 100ma current because the red leds need less forward voltage (than the white), I am able to run 2 in series with each other. That means I'm only drawing the current of 4 leds.
Here's a picture..
Click for fullsize:
I think it'll keep my visibility up at least..
Now I'm thinking of adding light on the bottom, for a 'hover' type look. Don't know what color though. More red? Maybe blue?