You might be able to pick up a copy of Princess Diana wedding dress. Or, find books, photos and other memorabilia of that special day in her life. Many options are available on Ebay.
I still have the newspaper that was published the day of her wedding with Prince Charles. It just seemed like such a magical moment for the world, I guess, although, it seems kind of silly to me now, that I would save it. Maybe sometime I can sell it.