Choose a location you like.
Go to MapOnShirt.com.
Use its t-shirt creator tool.
Mess about with the colors and the text.
Finalize your design.
Get a t-shirt delivered that has a map and some witty text on it.
That’s it. That’s all there is to say. I just dig this idea and am buying the one in the featured image. Thanks for pushing this impulse purchase at my eyeballs, Product Hunt.