Check out these:

http://www.designcrafters.com/greeting_cards/holiday_cards/thank_you/thank_you_holiday_cards_1.html
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How about: "Thank you for your continued hard work and your business. Be smart!"
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Happy Holidays
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Something simple like "Best wishes for the holiday season, see you in 2009!"
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Have a restful, enjoyable holiday -- you've earned it! See you in the new year!
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Merry Christmas, thanks for helping to make 2008 a great year. God bless you and your family in the new year.

love,

(signature)
offthedome
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Just say "Merry Christmas and Happy New Year!"

This is standard. It's part of our history, society, and culture.
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G'day Offthedome,

Thank you for your question.

I would write something like "Thank you for your support in 2008 and looking forward to doing business with you in 2009."

Unless you hand deliver them to each of your clients, you may well have left it too late. The last day for companies such as Amazon for delivery was 18 December.

http://answers.yahoo.com/question/index?qid=20071215134929AA1G6qY

Last year the US Postal Service said that December 22 was the last day for express mail before Christmas.

http://www.usps.com/communications/newsroom/localnews/in/in_2007_1220a.htm

You may have left it too late for this year. If you have their email, you may want to send them a Christmas email.

Regards
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If you're going nondenominational, then "happy holidays" is the industry norm. If you want, you could add your own personality to make it more personal, and that's usually ok. Unless you're tutoring the Disney corporation.
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"Thanks for your hard work and support throughout the year. Wishing you the happiest of holidays and a great 2009!"
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I say it's time to bring back the "Merry Christmas" greeting. It's part of the American culture, but everyone is so afraid of not being politically correct these days and hurting other's feelings. I say "Bah, Humbug" to that!
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"Best wishes for a happy holiday season and a bright new year!"
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"Thank-you"
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It's late advice for this year, but my godfather, a jeweler by trade, never sent Christmas cards, but instead always sent Thanksgiving cards. Thanksgiving is a uniquely American holiday and not typically associated with the sending of greeting cards. This made it perfect for his purposes. His Thanksgiving cards delivered a message of "thanks for your patronage/loyalty" at a time when everyone expects to give thanks. He delivered this message before any one else delivered their traditional Christmas greetings. His Thanksgiving message therefore never got lost in the flurry of Christmas cards. Even better, it served as a gentle reminder that jewelry makes an excellent Christmas gift during that buying time of year.

So next year, for your clients, send a non-denominational Thanksgiving card.
Source(s):
A mentor.

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