If you're using a framebuffer, I think you should be able to do this. Check out the man page for console_codes. (The part about changing the color palette.)
The first 8 linux console colors go like this: 0=black (background), 1=red, 2=green, 3=brown, 4=blue, 5=magenta, 6=cyan, 7=white (foreground). On my console, the next 8 colors appear to be "brighter" colors; 8=grey, 9=red, A=green, B=yellow, C=blue, D=magenta, E=cyan, and F=white. To change the color for "bright blue" directories to a different blue, you could add this line to /etc/rc.d/rc.local:
echo -en "\e]PC0BB5FF"
The part you'll change is the last 7 characters after the "P". (nrrggbb, where n=the color number from 0-15 (in hex) and rrggbb=the hex color code.)