I've been getting a lot of PMs asking about expanding the number of available designs and wearables which I indeed plan to do, but I'm afraid it's temporarily on hold. Apart from the one available atm (also mugs and mouse pads), there were a few more designs which we liked and that will be made available.
However I'm currently preoccupied with graduation, so for the next few weeks I'm pretty much tied up and fairly unavailable.
Not to mention that my GPU decided to quit on me, not last month or the next, but a week ago at the worst damn time possible.
Luckily, still under warranty, but it tied me to my laptop and wasted me precious time...
tl;dr: More shirt designs probably by the end of the month.