PZ Myers tipped me off to a science poetry contest:

Dr. Charles is having a Poetry Contest, with wonderful prizes to be awarded to the winner with the best poem about "experiencing, practicing, or reflecting upon a medical, scientific, or health-related matter."

Rules, details, and submission guidelines here.

And if you do come up with some good ones, please consider blogging them, and submitting to Open Lab, which will include at least one poem.