The blue tour de france I had in mind is this one:
https://www.autogespot.com/morgan-aero-8-supersports/2015/11/24

Here on a LaFerrari (Blue TdF in reality has been done in two variants: PPG 522 and Glasurit FER 522/C)
http://supercars.agent4stars.com/power-cars/us-specs-laferrari-tour-de-france-blue-red-leather/

As you can see the tone of blue really changes a lot based on the angle.

2010 Violet Aero Supersports | 2012 Green Vantage S Roadster