How can the walls be drawn?

In "How the walls are drawn":

• Classic: straight walls.
• Rounded: walls with soft round ends.
• Hand-drawn: walls that wobble a little, as if drawn by hand, yet still meet where they meet.
• Crayon (thick walls): heavier walls with a slight wobble.
• Pipes: the paths drawn as tubes instead of the walls around them. Weave mazes are always drawn as pipes, so the bridges show.