We had a service gift exchange at church and the woman who opened (actually stole in a white elephant style game) my gift got her choice of some hand made cards. She asked for "Thank you" cards to send to her son who is serving a mission for our church in New York. The missionaries for our church dress like this six days a week:
White shirt. Tie. Black tag with their name and our church logo. (My bro-in-law and another missionary)
So, I made up the cards to look like white shirts and wrote "Thank you" in a white marker on the tags.
I'm making more to send to my bro-in-law and my nephew for Christmas.