That's a good practical trick, littlewizzard. Magic should be adaptable - good idea to use aluminum foil, quick and easy.
Many people use little drawstring bags to carry their herbal amulets in; a specific type of these amulet bags is a mojo bag. You can also just use a scrap of fabric bound around with a string.
There are also many good luck herbs found in most people's pantry and around the home: You mentioned Nutmeg; there's also Allspice, Cinnamon, Black Eyed Peas, a silver coin of your birth year, Cloves, and Thyme - albeit a very money-themed lucky charm (but who can't use that).