This looks useful:
https://www.svgbackgrounds.com/
(via chat)
Some other useful background tools:
There are more listed here:
I like the faux code generator idea, but the CORS is broken so it doesn’t load the Gists, unless you go to this site first and click the button.
It might be fun to rewrite the code to work as a CLI program.
This is one of my Github “gists” run through the tool:
