I have an entry door that has a large glass insert in it with outdated gold linings. Is it possible to get something that looks like wrought iron that can cover up the gold inside?

If you are looking for something that matches the pattern and covers the internal portion of your window, that would be a more custom process. It would involve pictures, measurements and a considerable cost difference with minimums etc... Maybe a busier, more opaque pattern would cover it well enough to hide the color. You may want to request some free samples and try a few before you order.