|McLaren M7C Grand Prix car - Wikipedia|
The McLaren (or to be precise the Vodafone McLaren Mercedes) web site has an interesting article posted by writer Alan Henry discussing the team's colors:
"There used to be a time when Formula 1 team liveries were predictable and structured. The Italian teams ran in ‘rosso corsa’ racing red, the British outfits in a stately racing green, the French in a Gallic blue and the Germans in white – or bare-metal ‘silver’, as Mercedes’ well-hewn motorsport folk tale popularly recounts."
Check out Alan's complete entry on the McLaren Blog site.