Shader Graph; Flames! Scrolling UV Noise.
Here's a fun thing: If you scroll some voronoi noise based on time, multiply it by the inverse of height, and then step it, you get some super neat flame effects! Did quite a few different iterations and interesting effects. and also found out that you can swap out the noise quite a bit for more interesting things.
Here's some Bacteriaphage:
Some Crawling Crystals:
And some colouration for a standard fire!