There is a utility called "click for colors" to do this, MUI
shares the MagicWorkbench Palette, I think it is included with
MagicWorkbench?
Otherwise here are the palette settings that you can set in the
Workbench Palette prefs, in RGB format
Red,Green,Blue
153,153,153
0,0,0
255,255,255
51,102,170
119,119,119
170,170,170
170,153,119
255,170,153