As long as it's numeric. At best, you might find hexadecimal nixies, but perhaps they're all just numeric. And I'm not counting the segmented ones, because if you're going to the trouble of using nixies, you really want that iconic look of the originals.
Anyway, Bitcoin prices... man, that sure does sound like 2011.
One last thing about nixies... they burn out. And I don't think anyone is still making them. Apparently, some have longer lifespans than others, but I wouldn't use it in anything meant to stay on, continuously. It's best reserved for showpieces, IMO.