Put your message on a t-shirt. You don't need to rush out and buy a brand-spankin new shirt. You could reuse a shirt. Choose any medium you'd like (iron on transfer, fabric markers, or fabric paint). I chose to do a linoleum print.
The process involves carving a plate and leaving a raised positive image.
The surface is inked with a roller and then pressed or burnished on the final surface.
Here's my t-shirt.