This was, indeed, one hell of a thing. After re-reading it, I had a bit of an idea:
Omni-tools seem to have some kind of 'solidity' to their holograms, right? Otherwise you couldn't type on them.
I wonder if a certain technical genius with an interest in emulating her friends might be able to eventually adapt a method of producing similarly 'solid' hologram roses and swords as an alternative to using live steel around encounter suits. :)