I'm an IT worker, sorting out all the odd things your computer can do when you don't expect it. I got the job while I was still studying. Geography, mind you. I really enjoy what I do right now, but my love for geography hasn't died out, so I will enjoy cards with a view of your city, area, or landscape of your country.
I will also appreciate:
o art (reproductions, architecture, graphics)
o retro/vintage images
o crappy, embarrassing-to-watch tourist cards (you know the type - smiling dolphin with a mass of small landscape pics in the background, fat half-naked men drinking beer on the beach, terrible photoshop, bold, cheesy text etc)
o farm animals: geese, roosters, cows, sheep etc
o cosmic space
If you don't have any of these, don't worry. In all honesty I'm really easygoing about the image on the card, because the most important thing for me isn't a box of collected cards, but the moment when I see a colourful piece of another corner in the world waiting for me in the letterbox.
You can write me in your own language, so I will put the message in Google translator and laugh at the poorly translated results :)