I can’t believe I never discovered this before. I am never going to pay for quirky T-shirts or coffee mugs again, I’m just going to make my own!
Zazzle.com allows you to upload an image and slap it on to pretty much anything. I made a black T-shirt for myself a few days ago; it arrived today and fitted me well, (now just have to see how it performs after a round of laundry …).
For future reference, this is where I’m going to be adding stuff I make: https://www.zazzle.com/abacusnoirform