How to change the color of the prices?

In Frequently Bought Together, it is possible to configure the regular price, sale price and 'compare at' price colors from the app preferences page.

In the Visual styles section, navigate to any of the three different type of prices (Regular, Sale, Compare at), to display its style options:

When you click on any of the prices, the color picker will show up to allow you to select your preferred color. You can also enter manually the color value in hexadecimal format.