Here are some t-shirt ideas myself and fellow programmers were kicking around a few weeks ago.
"Perl programmers do it many different ways"

"Perl, the Kama Sutra of programming languages"

or a shirt with about 15 cartoons of camels fornicating in different ways. we've all seen similar shirts with other animals.

note that i am about as visually artistic as a camel, so i dont have any working prototypes to submit!