I was operating under the assumption that it will be to advertise GaP and you can use whatever tool(s) you think appropriate. Just kinda stretch our minds and let the ideas flow.
I was gonna check around and see what the requirements were for some of the t-shirt vendors. Things like file type, size, dpi, color count. Maybe even see if I could find a PSD t-shirt template to share with everyone.
If anyone beats me to it, it would be great if you could share.