Where can I find samples of thank you letters to lawyers from their clients for services rendered?

I have a book of sample letters, but the closest I could find for legal services is the following, which I had to make a few changes to:

Dear (attorney's name),

I just wanted to express my appreciation for the Excellent legal service you provided me (or 'us' if you are thanking him or her on behalf of you and others). (Here you describe specific example of the service provided).

It is becoming all too rare these days to find one who goes to such great lengths to satisfy his/her customers (which ever applies). I hope your *success will show others that old-fashioned hard work and consideration for clients are values that are rewarded in our society.

Best of luck in the future.

Sincerely,

(your signature)

*If your attorney was not successful in winning your case, you can substitute the Word "success" with " valiant efforts".