Multicolor nixie tubes

Well, just four colors (Red-Green-Blue-Yellow)   But it's possible to combine them into large displays
'Warm tube lighting' from the ancient times of electronics, before the era of LCD and LED displays

Article on these devices:
www.decadecounter.com/vta/arti…
www.radiomuseum.org/forum/itm2…

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Some tech details:
Blender 2.69: modeling
Octane Render 1.55: materials setup and rendering (pmc mode with maxdepth=12 at 12000spp)