Some years ago I ordered the Haiku LW2008 golf shirt from Caffepress.com. I wasn’t very happy with its quality. The fabric was kind of transparent and the printing was poor. It ended up forgoten in my closet.
I am now considering printing my own shirt, one that I would actually use. My inspiration is the boot screen and the result would be similar to the image below (with all the icons lit): http://www.customink.com/designs/proofs/krj0-00a3-gqde/front-big.jpg?watermark=false.
ROS (Robot Operating System) creates limited edition t-shirts for each release. I think this is a neat idea to celebrate milestones and bring some extra income to the project.