This is my own entry for the Drupal London LinuxWorld t-shirt design context. It is kind of British, Drupalish, and there is a hidden tux. Hope my tupence helps.
This entry is based on my earlier fat tap drupal t-shirt design, which still remains largely unpublished. It needs more work. I modified it a bit to suit the occasion.
What do you think? Where is the penguin?
Did someone steal your design ;-)