Not very related to cammo, but aircraft painting.
A guy I know was in charge of one of two Sea Kings, which were tasked from the mainland to the Malvinas (Falklands for English speakers), to perform a MEDEVAC (it happened on May 1982).
The Sea Kings were painted on USN light gray, unsuitable for night ops. So they decided to paint both A/C with dark blue. Unfourtunely, the paint and time only covered ONE helo.
So departed one dark blue, other light gray. He kept thinking: great, the Brits are going to aim at the gray blue, own forces are likely to aim at the darker one. In any case, they avoided ALL forces until announced (several several times) they were near to land.
They returned safely, also.