Odd Colors
Like in every breed also among Dutch Shepherds appear "odd color" that are not accepted by the standard. Mostly they are inherited recessiv and both parent must carry the allel for this color.
The tendency at chromosoms for colors appers two times. Gold G is dominant over Blue b. 
If the mother is homozygot GG (both allele for color are identical), so just carries the allel for color Gold, and if the father is heterozygot Gb, carries recessive the color blue, there will never appear phenotypically a Blue Dutch Shepherd puppy. One puppy always gets one allel from the mother and one from the  father, so the puppy will always get the dominate allel G from the mother and its appearance will always be Gold. But due to his genes he can carry a blue allel (Gb).
If both parents are heterozygot Gb blue offspring is possible. But the puppy must get the blue allel from the father and from the mother, so its allele must be homozygot bb to appear blue. Only bb-dogs look Blue because the blue color is inherited recessive.
Odd colors among DS are blue-brindles, solid reds and such with a white marking on chest. Here some pictures:

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