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.
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Hi..I found one here http://www.englishforums.com/search/Farewell+letters.htm
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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There are some free sample farewell speeches for the office at www.fond-farewell.com. Hope this helps.