The next problem was to utilize the voltage. Since it didn't produce any corona effect, I came up with the idea to build a plasma ball. For that, I needed a glass thing containing low pressure gas and a metal electrode. Luckily, light bulbs fit this description perfectly. A neon bulb would be ideal for gas discharge, but that's what neon bulbs do anyway, so it wouldn't be so spectacular. Instead, I tried to glow some filament light bulbs on fire. The filament alone didn't produce any plasma sparks, so an outer electrode was necessary to increase the electric field. And thus, these monster creatures were born:

Not only do they look disgustingly hideous, they do not work either. (Not so much of a loss.)

Then I remembered these axial light bulbs I used to play with a lot. (They're from the interior light of an Ikarus bus.) I connected it to the output, touched the side of it, and beautiful sparks arose! Success! Now I needed a metal electrode instead of my finger. Given the straight, cylindrical form of the bulb, I figured I could coil some wire on it. And just like that, my plasma tube was born.

I was thinking a lot about how I could make this more aesthetic. At first, I couldn't figure out how I would be able to secure the wire to the glass. Then the obvious hit me: using some kapton tape, of course. 

I also created a high voltage capacitor using insulator tape and bits of a copper sheet. It's purpose would be to limit the current. Later I would find out that this is not necessary. Anyway, it's a good idea to keep in mind in my future HV projects.