I used wiring from an old tv set that I threw out to make hoses for model cars. Like short, black, thicker pieces for radiator hoses. Thinner orange wires worked for heater core hoses into the dash. Really thin black hoses worked for fuel lines on the frame.
I'm sure you could find a wiring harness of some kind somewhere with white wires that could be used for those elusive electric football player hand warmers.