I experimented with various ways of creating a simplified image by making two versions and blending them together: one version would be mostly color, and the other mostly lines. In this particular case, in iColorama, I used a Water preset for the mostly color version, and ET-Flow for the mostly lines version.
I started with this photo from Pixabay, a source of copyright-free images.
In iColorama, I used Effect/Blur and then Style/Water preset 9. Save but do not apply.
I used Style/ET-Flow to create an interesting squiggly texture.
In Effect/Blend, I blended the ET-Flow image onto the Water image in Darken blending mode, using the lightness slider under Set to increase the lightness of the edges.