To change the color of a swimlane, click on the header of the swimlane. That causes a new ribbon bar "Appearance" to be added to the ribbon. The "Background" section contains a paint icon that you can use to change the color however you'd like.
HOW TO MODIFY THE BACKGROUND COLORS IN TRACKER INET Customer complains that because the background colors in Tracker INET are gray, when they print, it uses up a lot of TONER: This can be modified on the Web Server’s registry entries for Tracker INET: