This hook_world_alter() T-shirt idea was something Trevor Twining came up with way back at DrupalCon DC.  I got a single T-shirt made for DrupalCon Paris.  A number of people said they wanted one – though since I'm not interested in the business of making T-shirts, I thought I'd make the vector file available for anyone and everyone's use.

Enjoy!

This design is available under the Creative Commons Attribution-Share Alike license.