Just in case any Mythruna-monkeys here are interested…
At the request of a player I started down this path. After a few iterations (and shirts for every one of my family members) I finally have some designs that I like enough.
http://mythruna.spreadshirt.com/
This is a close-up of the latest design (with flash on) of a real shirt:
Other pictures can be found here:
T-Shirt Shop
And a full gallery of the progression of the real shirts can be found on the mythruna facebook page:
http://www.facebook.com/media/set/?set=a.339209779434880.75951.204533646235828&type=1