Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).I am writing you this letter as I wanted to express my gratitude and appreciation for the Campton Hills. Write to Your Principal. Write poems, letters or notes of appreciation and leave them on the desk of your principal. The message of appreciation should stand alone. Be brief, warm, and sincere. Employee appreciation letters help your employee feel recognized in the workplace and can go a long way. Here are 6 appreciation letter templates that work.