Michael Sacca for Brandisty (via Joost van der Ree):

Have you ever wondered what the most popular colors are in each category of the iOS store? We did. So we crawled the iOS app store and grabbed the top 5 app icons in each category and ran a histogram analysis on each one to find which colors were used most often. What we found was very interesting.

A lot of blue as usual, but also neon colors after iOS 7.