Maine Coons can be many colors. The only disqualified colors are the "pointed" patterns, like on the Siamese and Himmys. Here is a nice link which tells you about the registered ones:
http://www.fanciers.com/breed-faqs/maine-coon-faq.html
The worlds largest cat, according to the Guinness Book is a RED tabby Maine Coon named Leo, who lives in Chicago.
http://www.verismocat.com/htmscripts/leo-guinness.htm
I wish I knew how to post photos which I have saved on my computer

How does that work?