We go together to a specific store in our city that sells Sid Dickens tiles, and we choose one together. So, we currently have five on our wall, and it will be six this year. Because our anniversary is a few days off from Christmas, and we often travel around that time of year to see family etc., I take a few minutes to write on a slip of paper a little about what we did that anniversary and "where we were at" in life at that anniversary (ex. "pregnant with N"), and I tape it to the back, before it goes up on the wall. Strange tradition, I suppose, but we enjoy it, and it's about $80-90 for the tile and the only collection in our lives. Aside from our children. There is no gift buying for each other, and no surprise, but it's still lovely and I look forward to it all year!!