I like to take new eye screws and give them a tarnished and old appearance. It is a simple process of holding an eye screw with needle nose pliers and heating the eye end of the screw with my trusty pen torch till it goes dark and even red hot. Then I dip it in cold water to cool it down. I usually rub the cooled down piece with a paper towel to dry it and it give it a slight polish.
Depending on the metal the look is either a dull gray or a blackish color like the one on the right in the picture.
The butane torch by HONEST.