Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).The following sample thank-you notes illustrate the kinds of things donors would love to hear about you and the impact their generosity has had on your life. Discover 40 heartfelt thank you note examples for friends, family, and co-workers. Express gratitude with personalized greeting cards. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why.