We cover just that in this blog! You can learn how to write a customer appreciation letter and get many samples below.I just wanted to thank you for being a great customer and let you know that we value your business. Take a moment to send a THANK YOU, or a simple note of gratitude to our team and healthcare workers across the state, the nation and THE WORLD. Subject: Thank You for Referring New Customers! Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). Start with "thank you". Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. 42 customer thank you card ideas to show your appreciation.