Great idea number 1, making a super cool bat book. This is by "Bookfolding" on Etsy. There are other Halloween books in this shop too, pumpkins and ghosts, also wonderful.
And number 2, a classy Halloween journal from Baghy, on Etsy.
Number 3 is this awesome leather hardcover journal by TheSelkiesSkin, on Etsy.
Number 4 is this pumpkin book, with tutorial:
And number 5, is this trompe-l'oeil skull print by DogEarPrints, also on Etsy.
And lastly, and super amazing, are Tracy Chong's Halloween pop-up cards. Also on Etsy. This is just one example of Tracy's many awesome pop-ups that I saw during my search.