The poster below is kind of legendary. It reflects the North Electric color palette that was marketed by North Electric in the heyday of the Ericofon in the United States. The color palette in other countries was much more limited.
As you can see the 18 different colors are all old cases. In a later stage this model was replaced by a new case shell. But not all colors survived this change in the United States as the palette was reduced to 8 colors. E.g. the Charcoal only exists in old case. Princess Pink was replaced with Petal Pink in the United States but survived outside in various models.
Some other colors survived the first new case, but not the second e.g. Nordic Blue, Dusty Rose, Chartreuse, Accent Green, Riviera and Royal Dubonnet.