There are so many options for having your sign in book, and gone are the days to actually use a hard bound book for such. If you are trying to find a unique and original way to have a wedding “book” for your guests to sign, you may want to consider a quilt square option. Guests sign the square with a permanent pen, then they squares are put together into a quilt to be used for years to come.
See this idea and more here: Quilt Square Wedding “Book”