Here is an easy and quick way to make a book cover!
Step 1: Materials
Materials: a book, scissors, tape, a piece of paper.
You can play with the book cover material: reuse a paper bag with cool pattern or water-proof material such as Tyvek.
Step 2: Fold
You don't need to measure anything, just eyeball it. First, lay the book on the paper. Leave a width that you feel like and fold it over on the first edge, and do the same thing on the other edge.
Step 3: Trim the width
Cut off the extra.
Step 4: Put the book on
Slide the book into the paper you just folded.
Step 5: Trim the length
Cut off the excess that's too long for the book. (You only need 1-2 inches for it.)
Step 6: Cut off the space for book back
Make a cut for the book spine on both sides of the book cover. The width is the same as the thickness of the book.
Step 7: Fold and tape
Fold the top and the bottom to fit the size of the book and tape them down.
Step 8: Then it's done!
Do the same on the other side, and you have quickly made a book cover for your book!