I based it off a futuristic theme. Quite similar to TRON. It is made using baseplate duplicates so it is easy to extend and re-arrange. There is a pillar of light at each corner to illuminate the track as it is better looking in the dark. It is also made using print plates to give it an extra "smooth" effect.
Crappy DOF shot of the top part of the track.

Another shot of the top section.

Turn that leads into the drop back down to the start.

Top-Down view of a corner to show its simplicity.

DOF shot of the large ramp that leads to the back of the track at the start of the circuit.

And finally a Top-Down view of the whole track. (Stupid lights do not illuminate at this distance.)

Made on my freebuild server.