[Dowwie]

Have you run children's paintings through this yet?

[hcrisp]

Another suggestion: try running a copy of Tolkien's Middle-earth map to transfer the style to a more detailed USGS-style map [1].

[1] e.g. https://www.google.com/search?q=usgs+map&safe=active&client=...

[nuclai]

No, do you have any good ones? As long as entire sections are colored (not just lines), and those colors match with the annotations of another image, it should work fine!