This great article written by Kylie M. Interiors addresses wall colors for brick fireplaces, but the same principle can be used for trim colors to match exterior brick. Don’t just pick any color! Make sure it coordinates with the color and undertones of the existing brick.
To Spending your Investment Money Wisely…Enjoy!
http://www.kylieminteriors.ca/the-best-paint-colours-for-walls-to-coordinate-with-a-brick-fireplace/