When I was participating in card swaps religiously (which I haven't in the last few years), I got a huge cork bulletin board and tacked the pictures that were included in the cards on that board. At our old house, that board hung on a wall in our "mudroom", right off of our kitchen, where I could see it constantly, everytime I went in and out the back door.

Since we moved, I put it in the office, right next to my desk, so I could look up and see my "friends" while I was working.

It worked out great for us!