I don't know why this makes me think of it but the coolest "burning" thing has to be an "Oxygen Candle"

https://en.wikipedia.org/wiki/Chemical_oxygen_generator#Oxyg...

https://minearc.com/oxygen-candles-providing-emergency-air/

https://www.youtube.com/watch?v=g3Ud6mHdhlQ

Unfortunately they are "boring" in comparison, no flame/glow