Hacker News Reader

Those are likely custom, two sources that I like are Undraw [0] and ManyPixels [1] both of which offer free options. You can set your own color and select from hundreds of SVG sketches. That said both are quite popular so common sketches from each appear quite often on various websites.

[0] https://undraw.co/illustrations

[1] https://www.manypixels.co/gallery/

something like this - https://www.humaaans.com/ ?

Perfect, thank you :)

I've found https://undraw.co/ is a good place for this kind of stuff.