The message of appreciation should stand alone. Be brief, warm, and sincere.State why you are grateful. You are welcome to use thank you cards, branded stationery, lined paper, or plain white printing paper for your letters. Thank you for the opportunity to visit with you and see your facilities last. Wednesday. Both the interview and the tour made for an exciting and complete day. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). An employee appreciation or thank you letter is a formal message from an employer that recognizes the former's contribution to the company they work for.