Ian
My shirt design is a black shirt with the word energy whiz spelled out. It also has so many lines that look like electricity flowing. The reason I went with this is that it was a cool way to show how energy may flow and it was very cost efficient.
I prefer black shirts over white shirts so I like the fact that it is a big part of your design. I could see this shirt being in a store. I wonder if you could add a feature so the lines would light up off of a solar cell. I could buy this shirt!
Nice work on designing your own shirt. I like your use of colors and lines.