Accountants are as consistent in their brand personalities as they are in their calculations!
Based on this, we would expect to see a lot of blue, pink, purple, gray and black accounting logos, and very few that are orange, red and yellow.
In reality, we see a whole lot of blue, with a little bit of white, black, and green. Blue has high associations with being perceived as both serious and mature, and black is both subdued and mature, so it seems right on the money that these two colors enjoyed high levels of popularity with accounting firms.
At first glance, the popularity of green is confounding: it doesn’t rank high with being serious, subdued, or mature. What’s not taken into account, however, is its cultural color association, at least in the United States: money. Cold, hard, reliable American greenbacks are, well, green. While, on the face of it, green might not inherently inspire competence and sophistication, it has a deeper meaning within our culture, and therefore finds its ways into the logos of financial industries.