I'd prefer an image as well. The amount of text you can quickly convey with a T-shirt isn't enough to convey what I'd want; if I want to convey something with a shirt I'd rather have a design that looks cool and hints at some idea.
I'd want something that somehow reflects my love of technology and makes a sort of hybrid of the art styles I enjoy, namely manga, psychedelic, and glitch. Lainchan's glitchlain is a good example of this. I also like the kind of stuff Hiroyuki Takahashi makes (pic related); his visual style is pretty captivating and uses a sort of psychedelic manga style to describe a lot of cyberpunk concepts, like biohacking and self-augmentation, drugs, sex, and robots and cyborgs.
If that sort of style could be scaled down to where it visually makes sense on a t-shirt, I'd probably buy it. I get that it's difficult since the colors don't really pop out as much on clothing, even if you use that plastic laminate stuff to print designs.