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.
For most people, it is not new to hear about others who get frantic over what cover letter format to use. Truly, a cover letter format will help you in having an edge at your endeavor. This can help you land that job interview you aspire for. However, it really is not worth all the stress of browsing through each cover letter formats that you can find. You need not spend your bucks on buying different books and samples that you can lay your hands on.