Answer:
I'm assuming you need this for an assignment of sorts?
The best way to form your own analogies (if you're looking for, say, the mitochondria is the ''powerhouse'' of the cell, etc) is to understand the anatomy and physiology of the subject yourself.
The centrioles are made of microtubules, as 9 sets of three. They exist in pill-shaped pairs, perpendicular to eachother. The function in mitosis and meiosis of animal cells as an anchor for the spindle fibres.
http://www.phschool.com/science/biology_place/biocoach/cells/centrioles.html
and other links should help you form your own answers.