I'm a strong proponent of thank you notes. We received a creative note from a contractor the other day, it's a refrigerator magnet with a shopping list pad attached. The first page of the pad was used to write the thank you.
What a great idea. It can be sent any time of the year, the business card will be front and center every time the homeowner opens their refrigerator, and it provides a thoughtful service. Thank you, Jim with Vanguard Home Designs!