You’re definitely not the type to spend days fussing over decorations, but you still want your big event to have personality and memorable moments. So why not shelve the predictable guest book (which probably won’t see the light again anyway) and give the attendees at a Bar Mitzvah, a baby shower, or a wedding a more interesting way to record their presence? Set out smooth stones (available at many craft and garden-supply stores) with paint pens for signing. The resulting creations will make a tabletop-worthy display when gathered in a vase afterward. Guests can also make their mark on other items, such as seashells (for a beach wedding), miniature Christmas ornaments, or Polaroid portraits that they take of themselves. They’ll be so into signing, they won’t even realize they’ve practically done the decorating for you.