Anyway i was thinking of building an update to this: http://www.instructables.com/id/Growing-Plants-With-LED-Lights/ when i got bored and thought i'd put together an electric bottle garden in old water bottle i had lying around.
Although this is kinda similar to my other instructable i figure its different enough to be worth posting. Its also not really an entirely sensible project, loads of light leaks out the sides (but it looks pretty) so its more of an LED assisted bottle garden, and it would of been a hell of a load easier to just cut up the bottle, but i liked the idea of doing it just through the neck.
Step 1: Building the lighting rig
To do this you'll need:
12 red LED's
1 blue LED
a square bit of plastic
thick copper wire
13 220ohm resistors
you should also have a fair bit of experience soldering and making electrical circuits.
Firstly solder 3 LED's along a piece of copper wire at about one inch intervals, making sure they are all soldered the same way around.