How do I create artificial "salt and pepper" color in my (male) hair? 
It is currently dark brown.  Basically I am trying to look older than
my age, and more distinguished.

Well, I personally know a stage trick for this.

Get a toothbrush (Not one you'll ever want to use for teeth, ew! :) 
Purchase a bottle of SaniWhite. It's a Non-Toxic white shoe polish
used for Baby's Shoes (Baby's stick their feet in their mouths. :)

Pour a bit of the Shoe Polish on the brush, and work it into the hair
starting at the temples and brushing backward. With practice you can
do the whole head to any degree of Salt VS Pepper. This works for
beards as well. It will not stand extreme inspection, and it will
begin to flake after a few hours, but this is a tried-and-true Theater
method to achieve the look you are going for.

Also, dosfordonts.com sells Wigs in this and many other colors. :)

Alternate Links 
http://www.dosfordonts.com/haircolor.html

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Clarification of Answer by googlebrain-ga on 18 Jun 2002 04:56 PDT

Knowledge_seeker-ga seems to have hit closer to the heart of your
question. A professional colorist would probably be your best bet.
Most of the at-home solutions seem to be geared toward getting RID of
grey.

googlebrain-ga

Good answer for temp/costume applications, although I was looking for
a permanent, professional solution.

Or..for a more permanant (and realistic!) look, have it professionally
colored. Find yourself a high-end hair dresser and tell them what you
want. They'll do it right.

--K~

If you can find some henna (myrtal) powder it would do, boil two tea
bags in 100 ml of tap water add five teaspoon full of henna powder and
half spoon of common table salt and boil for 5 minutes, then brush or
mix content(cold) to your hair ; leave it to dry then clean with
shampoo.

It's also very easy to do this at home. Many people color their hair
at home. I can tell you how I would do it, since I have some training
in the area...but this is not a gaurentee.  What you need to do is go
to a beauty supply store, say, Sally Beauty Supply. All you need is a
packet of bleach, a tipping cap and hook, a grey hair color, developer
in a 40V and a 30V, Gloves, a haircolor brush and a friend to help you
out.
Place the tipping cap on your head, and pull hair thru with the hook,
in the places you want the grey to be. Then mix the bleach according
the the instructions with the 40V developer. Paint it on the hair you
pulled thru the cap, making sure it's totally covered with the bleach,
and let it process according to directions til it's a very light
blonde. If yu have dark hair, it will go thru  many shades of reds and
blonde till it gets there. Then, leaving the cap on, rinse out all the
bleach and shampoo to neutralize and remaning bleach. Dry the hair
with the cap still on and mix the color with the 30V developer, making
sure the ratio of developer to color follows the instructions. Place
it on the hair outside of the cap that you just bleached, letting it
process for about 30 minutes, and then rinse it off, following with a
good deep conditioner.
This will give you Grey hilights, or....salt and pepper. Same thing a
professional stylist would do, but I just prob saved you $60. Hope
this is another option for you.


Nenna-GA

******************************YOU CAN GET SOME GREAT "HENNA HAIR DYE"
FROM NATURAL EXPRESSIONS WHO ARE LOCATED
HERE: http://www.naturalexpressions.org AND HERE FOR THE HAIR DYE:
http://www.naturalexpressions.org/hennaforhair.html