The shoes were blue to begin with, so I just used white acrylic paint, some terrible paint brushes, black permanent marker, a toothpick, and a blue whiteboard marker. If I had been more professional, I would have gotten a liquid paper pen or something for the white text. Or maybe made a stencil. But I was working on another TARDIS item, and there was a baby underfoot (not literally – what kind of mom do you take me for?), so there.
Aaanyway, people liked them and I think they went well with my “Silence Amy” costume (pictures potentially forthcoming).