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.
Pleanty of examples of little phrases for a co-workers farewell card on the page http://www.fond-farewell.com/farewell-card-message.html
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Hi..I found one here http://www.englishforums.com/search/Farewell+letters.htm
A sample speech for a colleague could be: We are here today to say farewell to our coworker and friend. Though you are moving on now, we shared many successful projects and many fun times. We hate to see you go, but we wish you the very best. You can add special memories to make the speech longer.
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.
Examples of farewell party invitations are at this page: http://www.fond-farewell.com/farewell-party-invitations.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.
Yes, I can write a letter of recommendation for a coworker.
yes
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Yes, I can provide a letter of recommendation for a teacher coworker.
Yes, I can provide a reference letter for a coworker who is a teacher.