He means that in the address book, instead of the background always being white, it will match your background color so that you know how the colors will look on the background that you are using.
The question I have is... do you use the background color so you see how it looks in the channel/query window? Or do you use the nicklist background color so you see how it looks in the nicklist window? Granted most people probably have them both set to the same color, but what if they don't? Which is more important?
Maybe just have the option to switch the background color between all available colors so that you can see how it looks on multiple backgrounds.
