I, for one, prefer the blue, since it's a way to differentiate the drawers from other files. And it matches the look of DOpus.
I'm not sure if there is a setting to adjust the color. OS4.x definitely has one, but if there is one in 3.9, it's probably an ENV variable that you need to set manually. If it is documented, the info is probably in the BB2 readme/changelog. Check the BB1 docs as well, just to be safe. A hex read of workbench.library might also reveal something. As a final thought, also have a look at the commandline arguments for LoadWB.
