LED's... anyone?

OK,
Not sure if I'm in the right forum for this question, but I am engaged to be married in the latter part of 2006. My fiance and I came up with an idea for table "pieces" that require the use of a small LED. The basic concept is: A vase that has a place holder for a candle at the top, a candle on top (didn't see that one coming, did you?), some marbles/stones/whatever in the bottom and an alpha fish inside each one (water added naturally).

The issue is, we want to mount a LED at the bottom of the candles for each setup to light up the water, fish and marbles and I am not quite smart enough to figure out how to make it happen. Ideally, we would like to have the LED run off one of those small batteries like you would see in a keychain LED setup, or something of that nature, so it would easily fit on the bottom of a candle to shine downward into the vase.

Any thoughts?

Thanks,
Bionic