It's only a concept now, but designer Juri Zaech is working on a real prototype of his "Write a Bike" concept. If it works out, then you'll be able to special order a bike that spells your own name. Can't wait to ride the Neatorama bike!
Cubiclebot has more pics: Link
Breaks would be nice too.
Also: someone needs to tell Mr. Zaech that bicycles require pedals.
And it could only be stolen by someone with your name!
The thing is though, bikes have a certain shape for a reason, which is carrying loads. I'm pretty sure you won't be able to sit on these without breaking them (especially the one spelling Nina at the first link, where the front isn't connected to the back).
Anyway, it still works well as a piece of art.