I agree w/Chris, handwritten has more impact.
What has been a hit with my clients is the flower arrangement I send after the contract is signed with a note, "Thanks for the commission.."
After the project is done, I send a handwritten thank you card again, going into greater depth about how much I enjoyed the experience, etc.
They also get Holiday cards each year. I usually grow to like my clients, so the personal touch is very pleasant for me.
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