The Wall Street Journal uses many different color palettes in its plots. This collects a few of them, but is by no means exhaustive. Collections of these plots can be found on the WSJ Graphics Twitter feed and Pinterest.
The following palettes are defined,
Red/Green/Blue/Yellow theme. Examples: https://twitpic.com/b2e3v2.
Black-green 4-color scale for 'Very negative', 'Somewhat negative', 'somewhat positive', 'very positive'. Examples: https://twitpic.com/awbua0.
Democrat/Republican/Undecided blue/red/gray scale. Examples: https://twitpic.com/awbua0.
Red, blue, gold, green, orange, and black palette. Examples: https://twitpic.com/9gfg5q.
Other colour wsj: