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.
By following proper sales letter format, you can increase the number of people who will read and respond to your letter. The subject line must be motivating and the envelopes are to be very attention_grabbing. If you are mailing the letter, you can even use colorful envelopes printed with your logo. A famous one_liner or a logo that is not easily erased from memory creates magic for your products and services. Sales letter writing is more effective when properly formatted.