Christmas crackers are a traditional part of many holiday celebrations, and they're known for their colorful, poppable paper tubes filled with small toys and jokes. Some popular items to put inside Christmas crackers include small toys like figurines, miniature games, and puzzles, as well as jokes, riddles, and trivia questions. You could also include small, decorative items like buttons, beads, or marbles. It's also a fun idea to include small candy treats like chocolate coins or candy canes. Whatever you choose to put inside your Christmas crackers, make sure it's something that will bring a smile to the faces of your guests.