I've never made this style art myself but I really find it interesting. I used to watch a coworking/visualizer streamer that would periodically stream herself making paper collages. Paint collages/photoshops are a very similar mindset and one that I should work on.
A few months ago my partner and I did a creative reuse bookbinding class where there was the option to pull any type of paper media from their bins. My fiancee made an incredible collage of magazine clips, but mine was more of just a collection layout of old family photos and slides. I'd like to try that again with a more open mindset.