Our pharmacy compounds hydrocodone capsules-I've only seen it white.  Often
pharmacies will mix the active ingredient with a little bit of powdered food
coloring to insure complete mixing of the hydrocodone with whatever filler is
being used to make the capsules.  If you don't use the coloring-it can be
difficult to see if two white powders are completely mixed together.
If you are having capsules made and you have a problem with coloring-the
pharmacist can always leave it out.