The second generation had black-and-white text, simple graphics and Web connectivity.

CNN: Bold new e-readers grab attention at CES

That means it's black and white only, and can only show very basic graphics, but it works well outdoors.

WSJ: Watch Keeps Alerts From a Phone at Arm's Length

As well as adorning plain white plimsolls with his own colorful creations, Duffy lets his customers send him their own graphics, which he turns into a design for them.

CNN: A crafty way to beat the chain stores