Actually I found plasma ball, for next "Plasma tube" is perfectly fit vintage made in ex-USSR spectral tube LT-2 that filled with neon gas for science and research of materials.
As for me looking nice and also can be collectible thing because every spectral tube have an element inside.
Tube on photo have "Mo" - Molibden element inside. For your request - I could found another or will send random if you not notice your prefer. Can also erase paper sign and have more clear tube! (but I think it can be done anytime by yourself, so will send with labels)
Plasma tube having sci-fi look and powered by USB or 4x AA batteries. You can power it even from notebook, but I don't recommend you to do that, because that generate high voltages and sensoric parts of notebook like touchpad could work with false signals.
More details about LT-2 vintage tubes you can find by searching "LT-2 spectral tube"
Could be useful as night lamp, Neon decoration, sci-fi, halloween tool, collectible museum or any other method you want. Line of photos I uploaded as some variant that AI told me to use as background :)
Plasma tube have 3 modes: OFF, ON, Sound / touch react. Sound react is rude so better to say touch react or need a loud bass - then it lights the tube.