Had the idea of just capturing the heat map of a flame sword so did some web searches for videos which show people swinging them to get the flow of the flame.
Made a loop of the flame with as many frames as I could be bothered with (went for 20), including a cool flame pop I saw, and then quite liked the idea of just picking up the lit areas only in pixels rather than heat. Just watched it frame by frame and picked up the areas the light caught (and didn’t when behind).
Used ZX Spectrum yellow as a starting point and mixed up the pixels across flames to make the twinkle. White brightest and yellow and paler.
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so so so so clean