I especially appreciate receiving cards with mountains or forests or any natural scenery of your country. That's because walking in nature is another passion of mine, along with doing and writing science.
I'm also pleased to receive cards with poetry or sayings in German, especially if these are light or whimsical -- either poems that you quote or that are illustrated on the card. But don't worry, all cards are welcome!
I collect postally-used stamps and invite you to exchange them with me. I'd appreciate it very much if you use commemorative or special stamps on postcards you send me. And if you're from a country that has issued a Postcrossing stamp, I'd be especially thrilled if you use a Postcrossing stamp to mail your card!