Here is my very first material!
First contact with any node-based-texture-generation software and is AMAZING.
This is beautiful!
I made a few edits to the file, I hope you don't mind.
1) The Simplex Noise node isn't seamless, so I changed it to a Gradient Noise instead. That fixed the discontinuity in the pattern that shows up after you applied the Directional Noise.
2) I changed the Hexagon margin to 0.94. That fixes the Floodfill node's output.
The directional warp caused gaps in the hexagonal pattern when the lines are too thing. This causes the floodfill algorithm to breakdown.
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Keep making more textures :D