Neurons firing. I recognise one of those blobs as being oddly similar to the real-world administrative area where I grew up, not that I learned the actual shape of it until a few years ago. The blobs around it don't match though.

borders still look a bit awkward for coastlines maybe passing them through some smoothing procedure could make them more easy on the eye

Fine, but smoothen them out in random parts, to make it look more realistic.

Slartibartfast would be impressed.

this is amazing and I had been looking for a good voronoi implementation for ages! ty so much.

Fracas!

This looks a lot like the crystal orientation map of a metal sample