Plasma lamps are always fun to experiment with. The Eye of the Storm E-6000 from Rabbit Systems is a vintage plasma globe with adjustable pattern and intensity sliders. It is powerful enough to excite gases such as Neon, Helium, and Argon. The below video shows it in action:
The E6000 8″ plasma globe was made in the 80s. There are other plasma globes of this size on the market but not all of them allow you to adjust lamp intensity and pattern.