Why not one of those Nortika displays genned up into a clock. Then you could have your favorite empeg animations at the change of digits. I know, its not a cool as a genuine antique nixie tube.

I wonder if there are any glassblowers out there looking for a challenge.

BTW, I have one of the desktop Cathode Clocks. Way Cool. All the tech/geeks are envious.
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Glenn