CarpeTools [Design]> Create> Irregular> Maze...
This tool creates maze from Primary and Secondary color. The brush width defines the thickness of maze line and the lines can be straight and regular or curvy and irregular.
This tool also replace the design in the active layer. Click Generate Again to create new design in each click.

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Curvy Maze |
Normal Maze |

Visualization: Original design (left), after applying Handmade effect (center),With curvy parameter (right)