broken glass (take a walk on the wild side and find a spot where people break into cars frequently)
3-6 LEDs (if you want brighter, better, or different color LEDs than the stock LEDs in the night light)
LED night light with light sensor like this
The skinny is this:
Wiire up a few LEDs, slip them into the bottle and under the martini glass, fill 'em both up with broken glass bits, then wire the LEDs into the night light in place of the original LEDs so the whole things turns on in the dark and saves energy in the day, looking cool all the while.
Step 1: Drill Holes and Insert LEDs
Drilling a hole i the bottle is probably the hardest part. I broke one bottle and almost lost my wits listening to the unending screech of metal on glass as the drill bit bore through...
Once you get through, wire up a set of LEDs and run the wires out of the hole. I used 4 LEDs wired in parallel. More will be brighter, but might draw more power than the night light is happy putting out.
I slipped a single LED under the martini glass and used a little plexiglass spacer to hold the glass over it.
Step 2: Glue It All Down
While you're waiting for the glue to set, pull out your night light and start hacking.
Step 3: Hack the Night Light
Simply enough, open the case gently and clip out the LEDs. But before you snip, check the orientation of the LEDs. Find positive and negative and see if the LEDs are wired in series or parallel. The one I had was wired in series, so I wired my two sets of LEDs the same way. Essentially, pretend the two LEDs in the night light are your two bundles of LEDs in the bottle and glass and wire like so.
you can see the bottom of my tray in this pic, with a big black plexiglass spacer with channels cut into it for the wires. All extra fancifulness...
Once you get it all wired, plug it in and let 'er rip. If you get nothing try holding a hand over the light sensor. If still nothing, go back and start over... or at least check you connections, LED polarity, etc.