Business etiquette question: I spent a week at my companies corporate offices in the mid-west and met with approximately 13 people. They all took a minimum of an hour each out of their days to meet with me, and I want to send a thank you note to each of them. Just to thank them for their time and to leave a good impression. My question is do I need to go buy 'business appropriate' thank you cards or can I use my personal stationary to do this? I have the attached with just my name written across the top with plain white envelopes. OR I can go to the local Papyrus and pick up some Crane & Co thank you cards in a more business appropriate format. Thoughts?