You will need colourful paper plates (I got 8 blue ones for about £1.50)
Writing paint (£2.99). This produces a slightly raised effect when painted on.
I chose coloured plates because I was using white paint, but white plates (much cheaper!) will work just as well if you use a coloured paint.
First, very faintly draw the outline of a labyrinth onto the plate...
...then trace around the outline with writing paint. When it is dry, there will be a raised surface of paint. I had a bit of a production line going and could probably draw labyrinths in my sleep now! One of the children has volunteered to road test one at home and fill us in next week on how it went!