I send letters instead of cards. Sticky tape a bit of tinsel to the top and have the following...
--begin Xmas letter--
Ho! Ho! Ho!
A Very Happy Holiday
To You, You, You...
Seasons Greetings,Yes, it's here again. Another year gone and hopefully we are all a little wiser, healthier and wealthier than last year.
I was sitting in my office trying to think of something to give you. Do I send a generic card which will be lost in a sea of cards? Or maybe something else? In the end, I decided the best way to express my thanks for using our service was to simply say...
Thank You for using our window cleaning service throughout the year. Your custom is truly appreciated.
Yours sincerely,
Michael Ross
P.S. The enclosed "scratch-it" is an extra token of thanks
--end Xmas letter--
Each letter cost me 3 cents for the envelope, 50 cents to mail (that's the cost of basic postage in Australia) and $1 for the scratch off instant lottery ticket and one sheet of paper and a thin slice of tinsel. So less than $1.60.
I sent them out first week of December. Had a lot of positive comments. Good will building.
I don't care whether other services do this kind of thing or not. I do it and stand out in a positive way in my customer's mind.
Michael Ross