Truchet
Randomly oriented tiles whose arcs, diagonals or triangles join into long meanders.
Pens
Connected curves keep one color. Triangle tiles form colored patches. Starts with 4 pens and works with anywhere from 1 to 8.
Settings
Tile, Cell size (mm), Bands, Band spacing (mm), Hatch spacing (mm), Hatch direction, Hatch other half, Structure, Region size (mm), Split pens by.
The preview uses the default settings on A4. Press R in the app for random variations. The SVG export is in millimetres with one Inkscape layer per pen, so it works with the AxiDraw extension, vpype and saxi.