For a person that could not see, would it be nice to have different elevator buttons arranged into different patterns, not sure which ones, at all, or not?
On one hand, it would make things interesting. Elevators would remind you of different places (.?or settings), ? making it even good for the blind-person's inner state machine kick in ("I'm in this setting, I'm in that setting).
On the other hand, besides the usual usability features, having the interface the same on all elevators would, at least theoretically, allow the person to know where they were "in their mind", independent of the interface, while ease of use.
Note: in all cases, there should be nice-feeling protrusions to direct the shape of the buttons on the elevator, with braille.