Make your books look organized and seemingly free-standing with book-ends.
Take the hardcover off of two books.  Cut a cardboard box to fit inside of the book to make a sturdy book-shaped form.  Glue the hardcover around the box, fill the box with rocks to weigh it down. Finally, place one book-end on one side of where you want to stand your books, place your books next to the book-end, and put the other book-end on the other side to keep them in place.  Viola!