I have created a Boomershoot 2014 section in my CafePress shop. I only did some of the apparel items because that seems to be the only thing that sells. If you want the image on something else let me know and I can make it happen.
The image used is this one:
I forget who it was that came up with the basics of this. I modified it some and applied it to the picture Peter Biddle took at Boomershoot 2007.
Update: The color of some of the text was changed for better visibility.