There are lot of sample letters online try searching it on web engine.like sampleletters.nett.is a nice website.
and here are their sample...
It is with a heavy heart that I am writing this letter to you. Today is my last day at work and I shall miss all of you. You have been great staff at the Service Department; I sincerely thank you for your great support to me during my tenure with you. You have cooperated well with me to make this Service Department of high reputation.
I am moving on with my career. I hope that each of you will continue to give your best to further the interest of this company while you remain in its employment.
Do your best to uphold the good name of this Service Department and Company. I wish each of you the best in your future undertakings.
bye
Hi..I found one here http://www.englishforums.com/search/Farewell+letters.htm
Yes, there are templates available on the internet. The first I came across came from http://jobsearch.about.com/od/resignation/a/letterfarewell.htm. If this doesn't work for you, go to google.com and search "farewell letter".Components of a farewell letter can be found at http://www.writeexpress.com/farewell-letter.html.
When composing the letter, you should thank your boss for the opportunity for work for them. You should also give them your contact information.
A farewell letter to a co worker would vary depending on the relationship. You can summarize all the things you like about the person and the things you enjoyed working on with them. Wish them the best in their future endeavors.
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A sample farewell wish to colleagues would talk about how you wish the best for everyone. You can also talk about how you enjoyed working with everyone.
Farewell Letter was created on 2011-02-20.
Pleanty of examples of little phrases for a co-workers farewell card on the page http://www.fond-farewell.com/farewell-card-message.html
Farewell Letter to the American People was created in 1831.
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