Tail light:
I started off with your basic CatEye round reflector (please, mind the grubby hands).
Drilled a hole in the center of the back of the reflector body, used a little heat to separate the two halves, popped it apart, stuck an LED through the hole from the inside (got it here if you're interested:
http://www.oznium.com/prewired-superflux) and super glued the halves back together:
Tada! I plan to negative-ground the tail light to the frame, and run the positive wire through the frame to the battery.
Headlight:
Bought a headlight from
snarehead123 (thanks again!):
Machined a piece of aluminum round stock to hold 9 LEDs (same ones as the tail light, 8 white and 1 green), stuck the LEDs in, and stuck it in the headlight:
The headlight is negative-grounded inside the body and I plan to run the positive wire through the forks and up to the battery.