You won't see this color in many countries since some kennel clubs including the FCI disqualify this coloring pattern.While there is some controversy over this type of coloring both in the US and abroad, there have recently been quite a few AKC show ring champions.
The merle color pattern can be seen on just about any base coat color. Some examples are: blue merle, red merle, white merle and chocolate merle Pomeranians. If a Pom has a coat that is partly solid and then some coat that has this pattern, he is often referred to as a parti-merle. In addition, they may have markings as well; for example a blue merle Pomeranian with tan markings.
Markings are not always present, but if they are they are most often seen on the under belly, chest, neck and legs. There are so many variations that one merle Pom can and often does look completely different than another one.