OK, so people complain that Stable Diffusion and friends are trained on art so it's not fair to ask them to produce graphs because graphs are not art. So I asked them to produce artistic graphs.

Here are the results of the prompts "a graph with 3 lines in the style of X" where X in {Rembrandt, jackson pollock, studio ghibli, escher, van gogh}:

https://imgur.com/a/JW5c4in

So now we're producing art!

Art that's nothing like the prompt.