It's very simple to make, you just need a sheet of A3 green card with shapes stuck on from coloured construction paper. The lines down the middle of the track were made with cut up blank white stickers and the "people" in the stand at the top are hole punches. The little racing cars were from Tesco, they are actually designed to hold birthday candles. They are a bit cheap and cheerful but a nice size, and also the wheels go round.
You might also like my other playmats - a construction play mat and a car park play mat.