You could use acetate, acrylic paint, plus glue to do a dyi screenprint on the run. I did this, and I have shirts that have held up 10 years :)

Cool tip! I've honestly been thinking more about getting the schedule ironed out than merch but I'll take a look at this method.

Bleach stencil shirts can be ridiculously beautiful. They are also, for obvious reasons, quite fragile. Temporary wearable art.

They look cool, but man I hate the orange that bleach on black makes.

I had some where it was bleached up to straw-yellow. Looks gorgeous ... dies pretty quickly.

Sounds interesting - will look into ways of changing the color.

Basically, bleach longer or use a stronger bleach (which of course makes the shirt die quicker) or pick a black that is susceptible to your bleach (requires potentially pricey experimentation). It verges on alchemy :-)