This guy has a great tutorial for these on his website.
https://dancoecarto.com/creating-rems-in-qgis-the-idw-method
This community is for the display and discussion of artwork created by utilizing, depicting, or replicating one or more natural processes. These can include but are not limited to: chemistry, tidal forces, gravity, sediment deposition/erosion, lightning, organic processes, burning, eco-graffiti, pyro-chemography, fractal expressionism, photomicrography, colonization, etc!
This guy has a great tutorial for these on his website.
https://dancoecarto.com/creating-rems-in-qgis-the-idw-method