After checking with the owner of the inspiring blog and futzing around with getting the file changed to the necessary png, I am happy to announce the launch of a 23 things t-shirt!
Just go to the cafepress store I created for it. There are mugs and t-shirts. There is no markup: you pay the cafepress base price, taxes? (American, don't think so), and postage. Anyone wants to get into a group to save postage, let me know.