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.
Well, that was basically Ela's experience as well, and it was educational for her.
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.
The complexion doesn't matter, they are religions, not ethnicities. Also you are likely to get an even bigger reaction as you would probably then be viewed by some people as some kind of traitor.