I don't remember this from my own Bar Mitzvah. The first site I found said this was created by "caterers in the US." LOL! I will ask a Jewish Israeli friend of mine what she thinks, I will ask my Rabbi friend. In the mean time, here are a few links I found...
http://www.barmitzvahpoems.com/http://www.partypop.com/Forums/Bar_Bat_Mitzvah/m11438.htmBar/Bat Mitzvah Candle Lighting Tips
Keep candle lighting poems/sayings short. Rhymes are not necessary, but they can be entertaining.
Borrow another family's sayings or poems if you are having trouble developing your own; most people don't mind sharing (just substitute your family's and friends' names).
Group several lightings together in order to use the same song for groups of friends or cousins, like "We are Family" or the theme from Beaches. This will help the DJ/band transition between the candle lighters. Your Master of Ceremonies may need these song selections several days before the event.
Some families offer a small token gift or something personalized to the honorees.
You could plant a tree in Israel for each of the honorees and hand them the certificate when they are called to light a candle.
Some families light a candle in memory of a recently deceased relative or a close relative/guest who could not be there that day.
http://www.bnaimitzvahguide.com/candletips.php From what I am seeing, it sounds like it is a personal touch. However, if you need/want more help, let me know. Also, I will lend my mother's insights (I will have to call her). She has 'put-on' 4 Bar Mitzvahs!
Let me know if I can help!
Deeeeeeeep Breath!!! :)