Change your fourm layout to "Blues Default" and they are colour coded.
BG = Blue.
DB = White.
Neat! That's exactly what I had in mind.
Too bad the "BG blue" is hideous.
And regardless of personal aesthetic tastes, the white-on-dark-blue text is just plain harder on the eyes, hindering legibility. A pity.
Couldn't they just keep BG the nice soft blue of the standard layout and give the DB guys a nice soft pink or something?