I came across a blurb concerning this very interesting desktop clock today and just had to post it.
From the website:
This simple little desktop clock displays the current date and time in various time formats (including a custom 'strftime(3)' format) using little icons of actual nixie tube digits. (For those of you into old 1960's vacuum tube display technology)
Amazingly enough, an IRIX binary is available from the NixieClock web site.