Here in Afghanistan the people have the custom of putting henna in their hair, in their beards, on their finger nails, on the palms of their hands, all in the name of beauty. It gives the hair, fingernails and skin a reddish tint, depending on how much you use.
I've seen a few soldiers with it in their hair and on their hands but have never been in a position to take any pictures. At the humanitarian visit there was this Afghan National Police officer there with it in his hair. I snapped a few photographs of him so you could get an idea of what it looks like.
When women get married, Wais tells me that they paint these really intricate patterns on the palms of their hands. The henna stains the hands and the patterns stay for several weeks after. He says that if they're done well, they can be quite beautiful.
I've seen a few soldiers with red fingernails. If you didn't know what it was you'd think it was a reddish/orange fingernail polish. And if you didn't know that it was cultrually acceptable here you'd think it was weird (OK it still looks weird) but it's one of those things unique to their culture.
Anyway, just a small cultural lesson for everyone.