In reality, there are just some people who have developed this mania over grabbing hold of the most unique cover letter format they can find. They think that they will need all the research that can ensure their application letter achieves a desirable look. They feel that if it is not attractive or interesting enough, their cover letter format will end up being thrown in the trash bin.
You do not have to worry much about being a copycat if you do not find the most unique cover letter format in town. Just be sure that the contents of the letter have a clear and definite direction. This will bring about a good flow in the contents of the letter.