I've recently dabbled in T-Shirt design and created my first design, inspired by Mass Effect and the Quarians. The shirt comes in two flavors. Either the Paragon variant with the hearty phrase "Keelah se'lai" or the Renegade variant with the blatant insult of "Bosh'tet". I originally created the design as a tattoo, but the design looked like it made a good T-Shirt design.
I tried a version with the renegade symbol and the words "Bosh'tet." instead, but the red kinda clashed with the grey and purple and didn't fit well. I could still upload it to Redbubble if you want the variation, though.