I did indeed use a laser printer for this. The resolution on it wasn't great, but the toner is, I think, more durable that inkjet ink. Stenciling or something like that would be way better for sure. Or maybe printing onto vinyl stickers. This project was more of an experiment than anything else, if I build another one in the future more effort will go into it. In fact, the original concept for this was to have the frame completely covered in images, a big crazy collage. Then after hours and hours and hours of stripping, sanding and painting, I got lazy and just did what you see above.
Ghost bike? It's reasonably corporeal. Though I was working on this in the down time I had after I broke my arm biking, so in a way the project is similar to the cyclist-fatality-ghost-bike-memorial thing (if that's what you're referring to).
Here's the montage you see on the down tube. I'm not totally happy with it, but it's good enough. Anyhow, it had to be printed so small to fit on the thin tube without wrapping too much that it's quite hard to read unless you are very close.

edit: To see the full size, right click on the image and hit View Image (in Firefox, that is)
Thanks for the kind words, everyone