By the same token, I suspect the "Sand and Spinach" description was an attempt to clean up what the Green and Earth scheme really looked like, which is more like "Green and uh, Feces."
While the BF-109's in the BoB were mainly more or less a blue color, the Germans decided to paint one in more brown type camo to see if it hid their airplanes better when looking from above. Galland took off in the repainted109 and heard Molders giving a lecture to some new pilots over the radio on how to stalk a Hurricane. Suddenly he realized that HE was flying the "Hurricane" that Molders was about to shoot down!