How about a Perl Monks calendar?

We could have something cool for each month (and the cover). Then we could mark significant events on the blurb for the days. We can have Saint's days based on when the different users were cannonized. Etc.

This idea is probably unworkable because the cost to print a calendar is proabaly high, and doing the prep work for all the pages is much worse than for 1 T-Shirt. But I would love for someone to prove me wrong.