Here are two poems in honor of pi, from the Mathematical Poetry site:
If inside a circle a line
Hits the center and goes spine to spine
And the line’s length is “d,”
The circumference will be
d times 3 point 1 4 1 5 9.
Simple Simon met a pi man
Going to the fair.
Said Simple Simon to the pi man,
“You have unusual ware.
The pie’s I’ve seen before were round
But, gosh, your pi’s r2.”
Denise Gaskins' Let's Play Math 
LOL! LOVE the Pi man poem!
i think the pi man is strongly inapropriate. i mean how are little children honestly supposed to understand this?!?! honestly…
Little children are not supposed to understand this, of course. But it’s fun for the rest of us!
I think you should add more poems not just one or two
Thank you for the suggestion, Sharon. These are not my poems, though — I’m not that creative! There are more poems at the Mathematical Poetry site, but I just quoted my favorites.
I love the pi man poem!
Pi man poem is the best!!!
A pirate and a pisces
set out on the high seas
in search of the perfect pie.
When the perfect pie was found
the pisces wolfed 4 pieces down
swallowing with a grin and a sigh.
As he piloted the craft
the pirate he did ask
the pisces if he’d like to have some more.
The pisces answered quick
as he felt so awful sick
“I should have stopped at 3.14”