As a kid, me, my brother and my mum used to make bottle gardens, the idea was to plant a load of plants in a bottle only through the neck (think of those ships in a bottle).
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.