Right, but I am white as paper and it takes a while to grow a beard. I would look like a male convert, something that (to me) seems much more exotic than a tanned person wearing a turban.
If you really want to do skin tones, you'll need decent makeup. If you're in a big city, just go by a serious makeup store. (In San Francisco, Kryolan is great.) Otherwise, call up your local community theater and ask them to put you in touch with a makeup artist.